1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d81767a8c92f1057f988ff231c05074018ffb1dcc0485f62d8597fccdda68d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb44aafe-4aad-458c-a28f-c7cf34371ac1.json and https://artists.proofprofile.net/proofs/artist/bb44aafe-4aad-458c-a28f-c7cf34371ac1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77202dbcb3e7ac30224f26ebc7e0151ea096e26a116dbb391e4ca6750a40f3b2. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381e3acf824bf5f47ba57a2d15662089f2d502c3b7b86bc3e0ead3ae9a09a5c0. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61181332800e7733e1693dd60240ae52eacdb1931910842645b50f7b2fd3d0b. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41400061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a075f64368417f4a5c77bf5ffd48f68bf7c6af9a8ce24bacbe02fae68a50da1. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4772ef6588ffded61172ca974521812148cb46d37ca31f3d5ba0426a509087. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e40918305dff8e0fc791fbb5365149aeaa965902bc396f1e72af53f32fbd34. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T09:26:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10bd5a1144c90aa2e1e343d643ed0da958c919de91a33446155d95c1de8c665. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3162d20695a345d8b122f0b42c19044843d7dc824f1fcc3aa7492e21e29c77ee. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c975cd65352047af3d16a04dada6e1cdda969885d75234d20b55f9f4283e177. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3411e9935f28f0d94840ce8fdde4f36b779a99fa3275ce7aef4280ef21494fb. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2905fdffe6c545e42bb08a358c8486c36b04578f30817fc0f253de33037de382. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8da80861b4b97540930a6c910fd7d68311e9c41dea601856d1219da0646b708. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e62f06c48b336326679970346893fc525653e56b50f582b8c64fc28caa64cfb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7d0f407365669db24053b4ca7132f4a7c72b38150ba6a203018c5267ea26d1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd512688d8f3f0d9f1acf5d8f6c216ff0d1d5715a779c79d57dbd7f7bd6f3573f. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa032483bc8014eaae5ce36e708a3ac828da7dc67b4c34e8072b0f83132e7f586. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1f5d22bc44e06a80d10703c36cde84f21edd7bc13029ba21d9bd59fc02be1f. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf191cc0be1f2ea3eb85b92751f48ae14ed144097e2cdc4250ceb6a06da692299. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4fce07ad1ea3497c05dd031d572107583e0834d33524947b72e801dceefcf6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUE11838639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb38d8d28647623adb12f2a847456a80d2a9561ceff9e0d6f6fa89775c724b5. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUE11838640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99f55259afe2aba825a21f1e519ce4893457f36b8a01b0a887807c0742aced3. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:34:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUE11838642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275227c5a182573ec377f804f76396192a6062492cfcb2719c4a1fbace449d87. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41800035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c51db4511d8647d093296540b0c6dca92e2cc169bd195fa2291b4a681488ca. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41800037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb63e0c0d86b724a96d8ba257d2a3526dfb709611d5a706f936052bf86748e2d. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T11:00:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBW21900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e965f9294b2cd244f53451eb31faea94a5d334b2cb4240a037699083151636f. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:24:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42100006.
You Let Me Shine feat. Lukas Potempa - Fappe & Bru Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743fdbe72a4296abd8a899390d5a1bf5e1b5186dd2da9924cf070001bd12e42f. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T11:06:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307a445f9f273bf864835d35b683cdd974e65ad4ab8f5fe82141c45fe3136cc7. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T10:03:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9149a6c63e61d61b98dceef4c36537fbb1fe4460dc308f26314ebd098ba445e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4ed6a2ee819ff91f0cde6200c118324c197dc97d37fea09d9991cc3c575afa. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7b8a2672f69b282cfaad165b016f46d602a4daebf767ac56fad8350468b408. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbdcd33da1d0cc5505a152797e2665c07fb35ce558af34a4f3f16d3f5dddad1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382b56d2b033cbc2e97ab6e55bf7df483f4d0b5d31204328ab8eb158f095b9c6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-20T12:06:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02eaf4c57c3d7fd7aff1e25d5bc1932701fa68bdc37272bdf7bffb58ac526c9d. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816b3d48ca14d77bbd1547320e4ac1b6b2599e9c92326c9427f3cdcce7087f8c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY472477128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2cc7b74d94eae097b0f93e89107e426354e4a22aa7a1e63c8ed8e70c7527bf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY472477131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cc0810880313741f81801fbfe094f1c21fcd5ed0858b777306b84112baabfe. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY472477132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc527aaedc64493979ddae6cfcb6dd0b42e3821cfe735f46ecb36766dc3a13d09. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY472477129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbdcd33da1d0cc5505a152797e2665c07fb35ce558af34a4f3f16d3f5dddad1. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbdcd33da1d0cc5505a152797e2665c07fb35ce558af34a4f3f16d3f5dddad1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-21T16:29:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB42200065.
Let You Down - Alfred Heinrichs & Rene Deepreen & Lukas Potempa Radio Mix
Let You Down (Alfred Heinrichs & Rene Deepreen & Lukas Potempa Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca32a454d622922810c6ccf0d255a1e07e1682b11ff7de134cbf81dcc49029cc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECE72101506.
Let You Down - Alfred Heinrichs & Rene Deepreen & Lukas Potempa Extended Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000ca54649de7afb9c1e8e9837ec39ab0f98b7a8dde48ac64f95e8486d9792cb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECE72101507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d08600a7167456d1e3458784576a0160b8ab7785084697071bce47821d9f5dc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHB41500062.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch