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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300667becff58ff4b7304d4666d04b34db71da75eae618cf5785470467fcb8ab. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1013d50-b52c-42cf-9f2e-ea85fdb4a474.json and https://artists.proofprofile.net/proofs/artist/c1013d50-b52c-42cf-9f2e-ea85fdb4a474.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98697dab1078fa3535f64ad506ba4a6289e297c0f98e5199866855f14cd21f11. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBRKQ2139083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e474700284f8e211f45e01162c4a6e7ed725aff0ecc90afa118eb2f7708a2f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBRKQ2139086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8274f7f3816e9bb37e0b23e8a75148c939494b689270e53446d956fef0d114e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBRKQ2139106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6c7a7d0a7db6c461947e11beb9d93306c9fc13ca4f8fa7dd3fba14b03ac08f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBRKQ2139569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4043677780fc4c0a61afcbf4280d7553062eab9864372294cc5d23c557f05aa. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBRKQ2139571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475bf7e427bcffc6e5ef5a7de9d200f1212b008d657c890357ecfc69833bcd89. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/GBRKQ2139593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7203068027abb3e6121cfa7e0c8072697521b50cff34376f57accfe70887d24e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZMZ92578584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d40c6c1b4ad7ea2bdfdb9856c0f463e1f2fb1713863678b4f24474cfd669366. 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/QZMEQ2564061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce14e66f9fa57475668263f9c9fe7d78080873609f6482d581b9a83be83b836. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/US7VG2596127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5075d346052547ab44a71b4d6350feed86c36c44b680ff1a31743bbf55c80d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZZ8B2499356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139c7e94abc030a54ab1623586600a2c13e703ed4b4c313dc854df619c83ebd8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE5IE2300540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a1426eb4b40ee47895d0f3bcd02dde80b4421146851aabb904f8ecf772760a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE5IE2300532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0bf4c8b9ac22a2a58b69f254fa9a2797db0865da0bcc137e8394c692d246bf. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCAHB2336648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f53add41bf748a6c1a877c4bf01add0deb93929ca55df44989bdb66a7dc321. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAGM2280683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b821acd08561d0ccd8abe98577b9a81a6d4d237c56a080029423b40c0357084. 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/QZMZ92252800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c7d82802398ecc4a2ac3888b30eb27a42e32eb1521a6c3a7eb291f7687b3f7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHZ42179191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0896c2858a6566a6b07abb9c39fe74352209cf672d676460b13d30b89ebd8eb2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG2135443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fd54ac8525f86187d01f7ecbf2bc237b4e225dffac7e0a82f739c6a61b400e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US7VG2135380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b7370c70aeb69545cb2e4b7a0f20e8137ea10fecd51ae7038a77e47d2189c7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USLZJ2544300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cd89789a71aefc1c154cf7755af978889795e2346532b2886362a421fd823c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USLZJ2544304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808c5b203813bf01c8e8c41b79d242bbfdcd9889a64ae20b0a49e01ccdbc5bf6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBLPF0266490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b309dd4722e314f777e7a33e78b00c599b3c7fab732ff46576cad563a57e113. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBLPF0266491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9312890f026c154a3b719e562e1d928e5a2d6b7fdefcaf8ab0c49d8ea8d54f. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBLPF0266492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeaae1142768d810e1f8911d0ef7702c45d4e2ab85f8f8d7f0967e5b81418c33. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBLPF0266493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53652e63ef8d4c2fd1078ee48669908f52deac3fa37c637cc43878f621db5a85. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBLPF0266494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e8c87b01f0c042ef440805c556a6656bc260000145c5046a02f4fd1111078f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBLPF0266495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7703de0d6563b634c9440d0b1d47910adf33ad774a16a524749a12f68c7d030c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBLPF0266496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa193bd236bb06b293e655bc4d054790764fa6254f00ce6fb6d5154c7fba68fee. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBLPF0266497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf610886d57dc0ac668420b95265f84b9477b93c3058522b9f63bbcaa322f3e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZGLM2527057.