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 0x15684cc71f289a2507f57d7eb20a3ecc1ac7dd42666aaf77166f493f3e2995f5. 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/8230042f-769e-407d-812c-3121ee192c81.json and https://artists.proofprofile.net/proofs/artist/8230042f-769e-407d-812c-3121ee192c81.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 0xd8541b2b7ddb2c5bd9c60f066a034e6cc6c806adf6140929f4f11fd2b02d409f. 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/ITS782000461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1b6bf18539bf92eff26c79926c27096e6b9d7d58b4e4b07a1b3252275bc676. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ITS782300260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03cce95fa188ffd75f65dbad726286eba87fa8c2eb2ce084e11e326389c70468. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/ITS782300918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f18b3dbc34151b7b3ae0d91bef84fbf7247bc0a8ecdb1c8591bfb97d0b5908. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ITS782400407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb38ad1cfc421c91e81ab6925d74eef6f7d16a0d4765320b9dc70d95b602d6af. 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/ITS782400999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c881241f2ccafa70a79ecf50b85552f3871eb7085edb25d3519bd4cf697f5e4. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ITS782401601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc32cdf17eda422025700926ab97629aafdbce702f3ec83563f8d74bbb5ed15. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ITS782401840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee6e0b262f7eaa080d8495bbcc4697168fa727e94e03d8e38716a049b05d046. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/ITS782500189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eba3590dbd0e6696baab850259387e25e4d915bc2af79f0a5d36ec2241566f2. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/ITS782500320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c9d031279a610cb73ca785627fe88a6e5ed26ee49fd30542fe9ab5b04acfd5. 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/ITS782501241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d381fd5bf1e5fb6c1ffab49b3391404050ab6e133a5ea6c06796064b11dcd5. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ITS782501242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b111b8c0a2baf64fddfde129eab68fe74e52d41636d09c9a3bd96db75648f71. 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/ITS782000491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e51a1862622ff331f716d6bce67d9d8d8c9ce4b96659a8b8f61d245cb77f23. 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/ITS782300094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8541b2b7ddb2c5bd9c60f066a034e6cc6c806adf6140929f4f11fd2b02d409f. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/ITS782000461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75949e56143aa37c325d6862dfc483730402bd9b699ff1f242a78e92c51132b. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/ITS782000476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b61d46d9b2840cfd8f21ab56a9552c728d15728e6809c6b2b1a54f566ef03e6. 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/ITS782300917.