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 0xd336b4d4c52ec67ba13d61bbd868fbeded5ec5d3b99be343423ddc7d04c5f3ab. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0862a781-4da8-46e8-85b8-9b180c54c652.json and https://artists.proofprofile.net/proofs/artist/0862a781-4da8-46e8-85b8-9b180c54c652.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 0x625cc3f12053bced4a843e30991b4cbd64c1d1eee0a2c1ecc4cc985c6062e00a. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/FIERM1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d65f07e629e2f6a8bf48aaee5a3223ee1e42b4a0f09651df9ea5d5d35696608. 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/FIERM2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8f0b893be2a8ff88a738aedf97daee373688f72a8526e2add14cee0e65d3d5. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/FIERM2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1067324241227fca459762acbc75471e9f8ef9de5cdb65bfb81a39e2808594bc. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/FIERM2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625cc3f12053bced4a843e30991b4cbd64c1d1eee0a2c1ecc4cc985c6062e00a. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/FIERM1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1067324241227fca459762acbc75471e9f8ef9de5cdb65bfb81a39e2808594bc. 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/FIERM2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8f0b893be2a8ff88a738aedf97daee373688f72a8526e2add14cee0e65d3d5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FIERM2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517e8006bc7aa70db4dbda1f7d192f737213502156d917a8a6b88e2f17a4a2d9. 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/FIERM2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625cc3f12053bced4a843e30991b4cbd64c1d1eee0a2c1ecc4cc985c6062e00a. 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/FIERM1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746010e4873eba5179d9c59c988d736bc86ad02300e7b91ae358c2c406d94cf4. 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/FIERM1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1067324241227fca459762acbc75471e9f8ef9de5cdb65bfb81a39e2808594bc. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/FIERM2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dec29eabef1705b39636452cceae80fb92c20cf03ca16b52c63e19849e21c1. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FIERM2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dec29eabef1705b39636452cceae80fb92c20cf03ca16b52c63e19849e21c1. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FIERM2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3872dbc24b1eb3972f9cd3722e3b32d71274a14c437991db1b14faf8d49bbc82. 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/FIERM2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562121d750f00f2bf6e5e83fbe55d836cb8db942a12067213b435c07b9ba353a. 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/FIBAR2300181.