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 0xdb626861d6761cf74f33d5a7236d3419b2fb989ff0ffb4b47918ff65354a4270. Chain 2 (Bitcoin): anchored in block 953696 (2026-06-14T21:45:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/728362d6-09b2-41f7-9297-e66c69a1d41f.json and https://artists.proofprofile.net/proofs/artist/728362d6-09b2-41f7-9297-e66c69a1d41f.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 0xd79d598a98e95caf1d53a0a95b0735ac0df4e7fba59aa58ee39455d204249e85. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/ZA3E31600099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae178c45a4b7494f0f961f6bbded04108fba48e12ea2d7d6dbd540552e68823. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ZA3E31600112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba11084a0626a93cced9058e1f3bb4b21a8a5dfded9c93f29610b297f30693cb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ZA3E32400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124a8bdcd52aa09208a5aa034df3943251aad0f71ab0b6126f2447fda9f0656e. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/ZA3E32400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b6070bb7591f9eb6a34f8b3f96481f7a0966aa9b5fd14dc8ed80a25b2766e4. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ZA3E32400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d150ecb1fd2d804a475d9e89c7c90fb79a094d49e98abc42fd4b8d40ee6a611. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/ZA3E32400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaed11a50d0782294a03f1a14e38c14ed11509be837cf092a7262987560cadf5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ZA3E32400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c245ccbcfa8e7f10eced4ed1d73bee73174a96b60f42fec7bb3a6d31b44b06. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ZA3E32500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0719e485ef092566cd72f30be3cffad48b33ed31df8d53094b4b97ea72be0d2. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/ZA3E32500032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7087817ce268e03a581639cf8f6e6290f87d491ab3f1880d902a2badd078751. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/ZA3E32500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebf6a8a867d2de7d6684b5808a0c40d23393f782fb8155fb1df3186f2fa308c. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/ZA3E32500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acfac829dcb82b76b54985c5cbadd720797d0a749b020501c023d2c705adaf4. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/ZA3E32500035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6a1e1e75417c8719c6f2d4ddb9f923d9eeba9b72cbdd5136d9d77ef206d8b0. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/ZA3E32500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e4e7fd341e873ee77a520dc208b14be9b9102caa01c1c4153c8b4a1176d699. 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/GBKQU2432743.