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 0xe1fc354c206a11cde262d9325851d645dc6b877d581456b093a2c4621da8ee16. 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/057fb936-1b59-4935-8ea0-98f8c39f7e55.json and https://artists.proofprofile.net/proofs/artist/057fb936-1b59-4935-8ea0-98f8c39f7e55.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 0xea4592b20e547f45f912e8e6cfbb03488c14250ce28be68b2fc73b7519136141. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FR9W11508455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5ff6c9325aa22c0fcdded171cbb42d17fad4ae6b9d81ece7c81ad5e8f5914c. 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/FR9W11508458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2381f819b4cf100b73e92859a259bd6c665410c7430971743fbc123395bf25bb. 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/FR9W11508460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8826ef981b2a7bccddfe306c2f28869f7d524267b9d7ab1346341c5adf30b42a. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/FR7IF1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c04c31dde6f2bfa5c52c9f61737a73fcf281d90db134ce180fe67c1174fd7d1. 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/FR7IF1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba52145c87ddd31b8a63e756bee3b31bf8b8555d1c1a562951cfd9fd60274a61. 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/FR7IF1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f0737dfa93dadc7c12a6897d63a5e566de15e628a28545088f3c5f105220a5. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/FR7IF1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375f173d09991571a0e54de59a17eae62afdfd43c9b6a2b2d4178bcdb26a4cbf. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/FR7IF2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e35a620f57a216996755d7db99e750b1f59a4bfa75e5c3cc93a51fd009767db. 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/FR7IF2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821937769d494293d31f46b736e89d3438e383dd4b195f02396f02dc1f6ebb36. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FR7IF2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafdbf63a53fdd760aa514476b43ee7129ecdf8311ed08a766fc10c695983f63. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/FR7IF2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13017bb746edb62174c1988ef33be31ae07039d98adaece6fddd88376246809. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/FR7IF2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58dd6130568d80f3d2db5401f6b8b1d7a7ca30ded5482608480624d7affae152. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/FR7IF2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d465b50dee9332925e674bb03b93b4a3ad84b433ba09ed545a6423a8db65b7a. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FR7IF2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d273b0fdbeed92196656bf19dca14ca7da82a07cd1aac2473fda2bc041bd08. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR7IF2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8e60bae415be3453a81f156da8d6857a4044c7a858556e7864c4f90dab296b. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/FR7IF2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5821939546f6e80908c01bc352de2ae508fb0d3647796ffcf4eee88ae607cde2. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/FR7IF2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c0e024bed1dd6f0fbd06cdf0f4780a6ea89b170d0180abea243dd9c2e8220d. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/FR7IF2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6605e1400b579265379e25fc530e6842e1cd889fec3618dc79681a7ecba9b821. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/FR7IF2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf7da4394929a7bbd505e4fa8d1b7dd9d529586fb0e00a74bdc20f753a89cb3. 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/FR7IF2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df7f025e5f03115e580e58f0d03d749b3c87d8dbbc87e815543129623d8c845. 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/FR7IF2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf67fc96c6f8f204c6d55a6876dbf452971493c552c2127be44dcb90f01f51d. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/FR7IF2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc443d1cb64f23aba4e84b054474f11a244383e592c883e306930e5d97f6e6b. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/FR7IF2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f090dfbff87cf29a61f361f5e25b02198802d5edc592d650d0951717facfd0. 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/FR7IF2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28601b2c698f485676918fde28e40c90c9d5d1bf37d4a4ace4e625a863ac54a8. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/FR7IF2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8def3869a3d477539fcad596eee8ff1cb418a701e418690d6b4372f97ebd380d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FR7IF2500010.