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 0x87d2486cc1a3d016ae0659edd21f1c0896d20471eb491b3d5f2f57f5f2265ce5. 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/a8cff6a2-7e3f-4bc8-92e1-94ce18df5feb.json and https://artists.proofprofile.net/proofs/artist/a8cff6a2-7e3f-4bc8-92e1-94ce18df5feb.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 0x60dd0da9e153d49e608121a1456794632e20abf67295aee6324a9580c15f4682. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/UKXN22226492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97f1347dd3bdd2ed1166bfede640b691f6d4926de6b9a1058b664b520170b19. 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/UKXN22226498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdbeb44bdedbec7e457676b7ba51c0732b2d7bf4f2c906ad17b0fecba500bbb. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/UKXN22226491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feab9039e1c2368ae555252eb686902739128e7da54f8b21b19173e59af95b7. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/UKXN22226494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf744e698a7e8ca8e3c832dbe0837bebbf49426f6bd89d521c5c34f7a3899c87b. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/UKXN22226495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23d92570a9484a017a853a2bd5cbaf671701865a4bbe7c8668af86702626c47. 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/UKXN22226496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b32b8c814179a8b19ba719e0fdafdb4f51666967317a16eb1efc4d768a483e4. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/UKXN22226497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915785446d1faac5ab7e91db0f01b55ae266a18a4c8d5bd9599433b3605528fb. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/UKXN22226500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b6d94c09c4bf45d61a5781050666b956e2a40ff73e5c501320eec86e57e75e. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/UKXN22226499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2401e5c9503bd7cd7eb48bbbe7ab0f14af5c0a5c0bffc758fbd22611baf982. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/UKXN22410676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2401e5c9503bd7cd7eb48bbbe7ab0f14af5c0a5c0bffc758fbd22611baf982. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/UKXN22410676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e93ba5b13f483dc4769efd8b4f4449bdd90404cc72024411d1dc1abab6a2834. 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/UKXN22429730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fd9c313185b11ad9012bad49f34de81ba2939179680fc654a24b1b60330138. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UKXN22429739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43350677da09ef010063b832369b24df9eb07bc3e641d5b51d07e4500071930. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/UKXN22429731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5103302abb46434e38e1f6b1133acf66ae1777ec322bebe6bffbf84191a4c41. 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/UKXN22429732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac6a41618236e31c981a4808e3b5672faacad5859a90f72f713549c466adbc1. 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/UKXN22429734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33abd1d11a8da19ae8ac98c499dd58afa3466206a26c899e02765305e437dad. 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/UKXN22429735.