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 0x47f90f462707e04da447009a72ec436c6d6dd2506a661b2446f6932c0509cb0c. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/131fff9e-7561-44b3-925e-2b720e8013b8.json and https://artists.proofprofile.net/proofs/artist/131fff9e-7561-44b3-925e-2b720e8013b8.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 0xeba2312ca4261d3a12296f209ac2839614331ee25ef50c896b85ae72ca01bf38. 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/GBUQC2000521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa389d04a1dd75516f1a9c710b096d6e7a47994c0029f7a45d965380c1c5f4c6d. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBUQC2000522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1159a035abb19f581c81b853406c9d21c2362ee7ac8e110d2b0c5641e6533c. 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/GBUQC2000523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae6d1d32feac89988776ff3b2c211b442cc0b4eced6803799f751491253212e. 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/GBUQC2000524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57e0e76ed230df183938c9f27b6d2873d8d10074ec0373052aed1fcdb91956e. 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/GBUQC2000525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4df7537fc2fa96e84ce1d425a90667fab0b3ee3600bccd1be609fee44bed77f. 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/GBUQC2000526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f47619c6924ed79cadf23e687e41c36352f9fd2c15a3ad638576926b099de8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBUQC2000527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695f9b49be2f48cc2228cc7e4e3177ae8a7cb47164d1f72b2176f75de12c0968. 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/GBUQC2000528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e28466f3562e3639db7f1c0363a6ea19005134c25aafe4dbf73d3b4061abf39. 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/GBUQC2000529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde17074f0e46a804749daedd7bc9272b44d1869de88a96d0cd636886ac472d13. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBBTV1101467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f147a4f5ee355709c4a395c2729b36b06a51ab83816b374e78dbbdf2fb51f62. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBBTV1401980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8127261323afa643a798ca8a7b9c1c7abc68fb0f65761eb7c95a00ec07f93737. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/GBBTV1101489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e809b5ac53e827857a72e171f1e31c2f029f16d64edf186bd95c621edea1530. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBBTV1401983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e9f0e0f2c0355fb04385d62bc8e3d5de68429435d8d9b99a6bf10c61aa9cc4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBBTV1401979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890cbe84cd4960391169fd8de8095e00ecdf3feecfa22f6947e05bd594e09968. 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/GBBTV1101470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde17074f0e46a804749daedd7bc9272b44d1869de88a96d0cd636886ac472d13. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBBTV1101467.