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 0x7feae2df3c578e3aa1510f5832154cc4868c5097181f2f48c4145fd2af309e56. 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/fc984d3d-9ec3-4149-8a1a-b5d719e942ed.json and https://artists.proofprofile.net/proofs/artist/fc984d3d-9ec3-4149-8a1a-b5d719e942ed.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 0x07f138fe4fbeab856eae8487fdf717b5fcf17fa68ae95e29874574f40eda2b07. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ESA012063527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72eda175fca087d334563cfe0ef52afccb87bf4a2d138a54c01f42995d656387. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ESA012055389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d7bc634d1491772260a4d974c978c194c377fb06f5cab645804c535fc6afe1. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/ESA012048166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c21730919ba6a31bac2ae0c923a367b34efcc96296835e4ea770552e7360fdd. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ESA012063509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f138fe4fbeab856eae8487fdf717b5fcf17fa68ae95e29874574f40eda2b07. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/ESA012063527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be6148cd9ba6825d5d674e365f268aed5827c225d4ddf2220cc7af6f433d3d9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ESA012063530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa05454873011c54a08b94b137da91db5fe0971e147fb42102b9ff61be2d858. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ESA012171187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa05454873011c54a08b94b137da91db5fe0971e147fb42102b9ff61be2d858. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:27:09Z), 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/ESA012171187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04fe6256656d498ef5d42cacacef9588eecf9e7f8257d6aa5501adcd7c63f09. 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/ESA011565047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd270ddc6050ef5b89260665b96ddcc8e04600fa8cf83ca1fed25b0b042b7c124. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZNW72232403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0abb6042656e5bef075037216203a39fdebab72365c070238580b8a65e6079. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWDW2390203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7617f34a9cc13e365a8acb30be811f628f0cc17e93372ef988162a9e3cb99420. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ESA012048171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8faf74335a35001037d6595587b9b988170c53d5441db34d6aeb01a5d52ea68f. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ662465848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9bdb3a745d776587a6a0a9e1d996301f135ffe49e1a9253beea06d68f0b7d6. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T18:49:38Z), 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/QZWDW2403411.