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 0xab91d497207e6e2ca87de119810b3a10416bcdaaa285e5b240d90540a6202f53. 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/7251ac0c-0171-4398-83f5-318a40d709ea.json and https://artists.proofprofile.net/proofs/artist/7251ac0c-0171-4398-83f5-318a40d709ea.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 0xd12ff74518a62deca7fabd90fba129c5a27a2ee1c1df8f973dcfe5d31190c359. 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/PLH181600642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20744bb0abb44922381c527689b62f05af4bc8890ae3c165cf02ec4195543715. 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/PLX632100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984a3b6e6e3766aae9a22879a22b3cbf5c1c5956b27fa92116b8f6964800fccc. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/PLX632100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e3c025295322f2b0ce611e0e85ec563efc7fa4626330e8d06c9b730f7b4deb. 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/PLX632100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f5172b6e5f427bda8e32ed6b8776e507d412ad8d7e42ea2193f27c5e6644ea. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PL2DY2200100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4d772feb0d11060ab7cede52fd896c999b6e9e62a22677836b0b625d8585ae. 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/PLX632000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154b35bfd33f4892e352a9e64978e18de4be5564590abd90b5f1a27bed6b231e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLX632000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cda6f484bf5bc00b280de62678e80e0b8f605d5abd7b17b034046439dceb98f. 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/PLX632000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5688d9a93d0f3f496151d8da30862ccf11f28c9b5a2fb851058f454bff35ad95. 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/PLX632000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc633dc2ff2301c7534ed8ee9f821b8c9e06691a41f1ed401d749d0331278804d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLX631700019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3c267f15321c2efb0ab78e5ca7a50795d2e79dfa83356dc6daa1e1b1a6b968. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLX631900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84883f7be20f01c4661785dc75bf4edd7e949aa925f0fe54addf9ee3f257caa. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/PLH181600668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed9e084ddb8ac2ab732d1ab41012d882a4a5cd27eb925cf05a8555f06a38069. 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/PLH181600673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd315d01c8dbc426a53e9f7e23e373498a7025d3098062601da2755580e238d9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLH181500526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626899a359404758f43dec278455309dc4a4fa7f7db2199f77378d3d8642e98b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLH181500531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43f752f143245531993ded857902e2475113c4ee4fc95bb27e2f19cb367eb50. 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/CA5KR1819297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ff9b9ec5c9c99796726da10b5da5d05d8815531b28ddc46ea1794e122917a2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLX631700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4764f4ed65d23960d2f690f47c3161b91c8517c9134c4a8649d576ae55dc5045. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PLX631700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371c0cb6d8efa3028c2bd9795ea8a8dfc520d2f2f2bdb49a3359960e8d7623aa. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/PLX632200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2497b0c1639b29cb81a3c24777ae7a9e20e405efefb17a53d0e202981c61b570. 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/PLX632200027.