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 0xf648330573ecc3a4a6f5f4a703446d5ee12ef2e7b0e48ebfa23fd8525f93d2ad. 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/add0e380-17f2-447a-9f7b-66524adc0714.json and https://artists.proofprofile.net/proofs/artist/add0e380-17f2-447a-9f7b-66524adc0714.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 0xcec10df3489a468663f3b7b882c50352ef2b69ebcb2117896ef019b7f9eb59ad. 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/DKUM72100067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb26b289867d31f3b3792f32eb20ddc02d4f72598143262e4d998eecabe59f8. 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/DKUM72100068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54f5f29cea6088fb11a8749d0e6d48e208c1f3af0ae6e2fe0e4e44258399f61. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DKUM72000215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752b47d64aebf47d59a83f545996b8a5548c78c9a6d48c16189b09727d98ca0f. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DKUM72100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4c2bdf8fecd12fb7d91e8a356e56cad6a1cf3d59e0ab421160002c265896f6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DKUM72000841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c7c5fb03c982f9406c5ed30b767bc07f84643c9d6a6f46668c1591c9bbe255. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DKUM72000842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9770f7ebd2d2aaaee113e91d200e00a3cab6c4a20e69de813c79c5cbb625045. 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/DKUM72100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc6c2117e9f44c875a89e685334b5f7cc4fe800a8117949c19112974939ac09. 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/DKUM72100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fbfcc9045cd5365b27a4b82073a50252b010863eaa5478aed9d8ca0d28904d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DKUM72100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c2420ed626162bdcdcd94ff72bd76a3f75a3e3b851227362d75cc580a36fc4. 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/FRX872368582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e8f2239e892f26e0d30993d031bdc95bb1f88bcb4f22da38d3021e0d4c86d4. 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/DGA062307902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd86651978214bf7a7dd81f9d72ad085a9b64d3352d38aa51b2fdccbcbb2a9d0. 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/FRX282200553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9f0d1c4c4dd97368e876cb745b14dbac11f53c5b40489d96f5db361c262fc3. 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/FR59R2292188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b6c8bd1880fa985f62c51697b158f005e6166751667c91e372a07ece7b3562. 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/FRX452154867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752c892e5e733db65afe5bf047f2d7e6ac5e4c7a8516045212fb725a016bf74e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DKUM72000580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e40ac41c97b3482f5c45f66717eef0799b6051a282ca5a5a15d2d055727a005. 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/DKADG1900187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23786beb3ef6501572b2eb5eb1782e45307019691c33ff66ddffb4fd9cf663f1. 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/DKADG1800360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4c2bdf8fecd12fb7d91e8a356e56cad6a1cf3d59e0ab421160002c265896f6. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DKUM72000841.