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 0x17a755fc19ef1e75dbfc71878e104350a8e5ac93ddcf8d4a25b12f518cfe834b. 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/53fa93ac-d517-401d-b321-c9af1780d503.json and https://artists.proofprofile.net/proofs/artist/53fa93ac-d517-401d-b321-c9af1780d503.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 0x9a85366c34bc3175ea0a336f0832deb78a131ca7c786516e0bc274c7a7259d94. 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/QZFYW1992547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fa45cbf658032f3b603c6f8f18cf7d080a5d520c23eac4abb62bf985431373. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZFYW2089915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa068cb1bb46a2560c0b56150525a541c808dade1bb4660d090a38226adbbbc53. 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/QZFYZ2185667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d40240f810b8866a7780f73006178b6d6f2a0839c6f5273b4b2dc30dc4d6bb6. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFYZ2185668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1278143441843172d4f2eaba9e6ef68db5e012c964c712c62490fae0999b3ac2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFZ22130644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349b58d1f30eaa4e7107b02fe3415920f504f639ab8a830ad65129d493e6062c. 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/CAUM82200499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac19b7853327c05507cacb032d7c98a3321d383177249a43e7ce7565e83cc30. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/CAUM82200501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa334b76c6450e4d5afa69820511544113d1c3c94e75bf4fe5fa2161da1fdd10c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZK6Q2489473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a18704734690c5f2c81d7a3abee959e310af6e63972484279ab81ccbb4772a1. 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/QZFYZ2519863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddaca8e54d7e0f0b02248faa5f54fc1923e2575f0fbd92193f08b906cc93b6a. 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/QZHNA2433953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a9d7cc3d1783f9499ee6e7ea978c8bafef69ce0397adfa7da0442caeab1331. 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/QZFYZ2519864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd61ca81da6aa104ead9ae29f615f5c348605c7ec6adaa982ea31ce2a62be647. 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/QZTAW2432044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673b13a1b7ff98c0c578ecd0e40bb48bbfda967c7dc028c259bea5d81aad6da4. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZFYZ2519865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa334b76c6450e4d5afa69820511544113d1c3c94e75bf4fe5fa2161da1fdd10c. 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/QZK6Q2489473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760dab0c5b9372028575eab4fc10bd1bed6e215c86dcd3af1fa6644652bc8081. 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/QZFYZ2519866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f316d9c56463cf39e126457ac8720aa90db32f8047e79e5142bb0df3d23f59c. 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/QZFYZ2519867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d2538bbf0a36ad8f97fb01b948bc6b2c7c281ece445c929ab1dc288a956140. 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/QZFZ42485948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a9d7cc3d1783f9499ee6e7ea978c8bafef69ce0397adfa7da0442caeab1331. 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/QZFYZ2519864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2256aaf2fa506fa51196c51212866e0918be1d5e96f4bff29a5f2cd82d44c509. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZWDD2275825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63dfbea6e1d16f5808dd60f731896a527ca8b73aab49febf7e6157e519e4be35. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QM6P42090613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22f0b2813a868de557ba601aed957f85fc4f086407251e030fa4f149db2d5f6. 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/US25X2201013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e1af96d3e0b48fa7a288b2c3c4d1e5a139ed74cb5ef7e64b81c4da10565464. 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/US25X2201014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ef653e2935c22ebd713c5da080ea6589e57244c2c8d1af25b5997e9ed5981d. 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/USLZJ1948769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164bb53b685bee9dfce499695ee2295412d2a5292af6a90503b0a4eb3ede5fdb. 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/QZDA62162966.