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 0x657e9244a7a7685c45a79004dfc6d62e5bf9a3b254b134482d47797e488296b8. 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/20d64249-df44-40ef-9f75-187966438fca.json and https://artists.proofprofile.net/proofs/artist/20d64249-df44-40ef-9f75-187966438fca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xcff23793b5c078509b99631e7db399bca416d32a8ea1e5bf3be362a37d635a9a. 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/ES71G2145656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5eac0553ac5ece0a73c97051f706ee1ba12597fefb314bd31c4141be387f72d. Chain 2 (Bitcoin): anchored in block 957658 (2026-07-12T05:03:28Z), 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/ES71G2215391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20654052e5e1b2b2339643fedd355bca16d7f16141ad469f08abf4899f3d34c0. 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/ES71G2215395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8305f2e71b989393ebef8f02e554c2897cdc6eb074996b0247b5bc344aa4086. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/ES71G2215396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b35b93e19ee54f99ebb05673cb1355a4bbc49d49399c5e06aea807679bd8541. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/ES71G2215398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5458babd1996d019174f61a1d7c1bfe30ba774860add780ce9d64c0e54d9c0ab. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/ES71G2215399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99650054e622a030e3463a2dc8e5a6750654ee4be4d25c296dbe94f5c1f418f2. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/ES71G2215402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ceeef96f3ebd81a4fafdd4966330656cdad4feeb3c4d6b72a8a721105542ca. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES71G2215405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed16dfdfd2e50d0d74aac070ecda53c792733ac960150c3f513c0f4ae829a43a. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ES71G2215406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040055304c14e401937c6ed78026f56ff6225336d6e5c92e02159aeae85f3982. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/COATT1902840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9891c49f32fa9e2b95781a8b2c822ef6eeafdb0761dfc9065a4a4db35b64aa6. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZNJZ2546843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ff6fa19b35ed61e7f5cb14784ad3b914f76d5724c6f56d1cf4f7a81f8e741d. 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/QZNJZ2546847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62789ecf8407e42e4064be8fef6d8cc431ad294ffe9b6f9e81bd38c799e2c425. 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/QZNJZ2546848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967bf16dd0f90e4a82c66286e31df51d6fe916ecf92dcb8ae30d8dbc44a0e100. 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/QZNJZ2546851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5db02958ea43f6878f5fc37106712d09f91ace912b2676b03b714d7a371587. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNJZ2546852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0a05ea0ff971f40c23791978157c84941a2cae7c1efacab574c5ece227e8c9. 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/QZNJZ2546853.