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 0x64affbb299a4582acceacc73822873bfcde0eda0fc0f438d9584c72fbef83bb1. 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/0a421c34-f495-471a-a2f3-9c443a8548de.json and https://artists.proofprofile.net/proofs/artist/0a421c34-f495-471a-a2f3-9c443a8548de.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 0x83edf8c803fcf544f76014ea0185415b56f54c2d7de9fbd7eefc49feda0e8b75. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/GBLV62316580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b87d1802cf70540096bb584dfc3574f148838e5996d44ea267cf3ac560865a. 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/GBKQU2313947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa144bc1bb9e498e7970627b29ee032b1765ac258823c3934c94c9ac527b198ed. 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/GBKQU2313948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8b5ebc8b40862f6f8c4aecf9c7443d7c04ee4c2b46047e0a689f58a9fd31d9. 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/GBKQU2313949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a367c1c061b99e43ebf361471286361ec4301e3f8ef0adfe43be1240c310c5d. 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/GBKQU2232578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d87b8ba4fdd9938a5d1e8f0de8c60cf2709f09cfcfda44c86abfcf970989446. 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/GBLV62128489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3359a58c9f5a84ea0a8e369c5fb693e8054132ceeb0cd8c5031afdc27e4bf03b. 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/CA5KR0007567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea34d0f28d28566e2a05591a5901045003d5d23d975cbbb02d65052f60a63ae. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/CA5KR0007568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712b5d3a72f3873c100d94da7e8a89d25d575fd6f95ae2f4320171038aa27285. 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/GBKQU2140188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d458e04e55fafcde7a4ba31226ba41f0f4714d3aac0562f2934f03ba316582c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBLV62030195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40355f83deb70ad4be4cd3acd2686e7bbb53598922283c9d463704d8969baf4. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBLV62030196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8c7098e8e7e7cc2fafaf20892644dd3f879909433dc9c489ad8e2aefd5a782. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/GBJX32021011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8a22917f4663ad18312b51ef24c763145891f7825cbe8b48e31726c252f9a0. 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/ITA061301926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c9abc94e50bebf32b3a66851e5e5078d4fbda3bcfb2db1a9050e6ebb9c79c0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBK6Y1720501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc13a4d4d2d7efb51ecaec080e81fee33ca520d3361f2cf4cf151bb0aa80da6e. 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/DEHE41700035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67343204cdadb10789ee4ea538ba8d4b692f5817a1aa632f01b90b45942d182b. 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/DEHE41700036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b871425f66bc7c822fc7c528a904fbec567a746f2d1ed79bc8d8f5eea1b3d63. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/UK7FL1400056.