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 0x87d6101ca1417a916d278c75e622545d031ec68a175488b08a642aceff63903d. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0229ccf9-4d7e-403a-b693-0ea96c281641.json and https://artists.proofprofile.net/proofs/artist/0229ccf9-4d7e-403a-b693-0ea96c281641.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 0x7c6bc9903387e31c148f7755c64cd77203dc4a834d55ffb26738f82c6442787b. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USL4R2385455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8ef1a4ee6b2cd19520a19bc03d0797261b1eb3688e244643297b5eb83b1db1. 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/QZNWU2320092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d0d81049590fb496dc82be5fe416c87198f4c2d636e95d8684f6a128058cf7. 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/QZHN82187943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0976b73276bafe7432725664077b5e757bbb8fffc10dcc9301d0748d089cb9. 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/QZDA52121913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb9141050dc8ffb25511acd9eb35d40bf1effab65444bfffb0c09f0583c71a0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEQ2065015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee13da1af756721422c4d9ac58e92b9c4b8ded0d831f71cac51ec0221e0a1ee. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZW9L2375861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2061073b4dc596f79f4f3a422842442635f35a58111632f41618bba9e61558cc. 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/QZW9L2375862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02dc36a8ad7cab0707101c43b22b98d0619781ec9e28a5eb7c2422c38f18db1. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZW9L2375863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d439bffd0a115b6becf1b9e94161ef24fd56c545f117d2d1e2c3892dd0c1b6. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZW9L2375864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e04feb2c9dd480ae6c6e64ae8096322adea73ccc4bb7c566256df5cf804222. 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/QZW9L2375865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880276ea488495bc966e096d090ff4f4959327cd079d2a4bc00c75b36583466a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZW9L2375867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81e8a61474c11040cc2de0e89781098ccfd9d7c98135a296c41323c3ef1ad0e. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZW9L2375868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2988f114f763fe81d0e924e60a9337b3a932650f40363dfe006c96d1e402fd7e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZW9L2375869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea960bdd58155ac3d9bfcf9cc55d8692423b8ff95e3d044afd348cab95a6e70. 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/QZW9L2375870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ffbf3b8d752e6ef52fa3502811172af350667ffda8c594333f9e072cd82807. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZW9L2375871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c852f9c71b8486bca3417c9babf39ce757a287c0879fcb7c2d3c22388d03212. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZW9L2375872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf791797de742583ac9f51dd0145af75648303a965475edf6ca98c9403f4e567. 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/QZW9L2375873.