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 0xe3fe4678ae62dade0b711fa0dd2faa1dd56da7f4801523a8f7655e2054e66b08. 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/1b18fa72-6507-44aa-9ec3-2ea81e4e63d3.json and https://artists.proofprofile.net/proofs/artist/1b18fa72-6507-44aa-9ec3-2ea81e4e63d3.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 0x1c3bb10551ad0c7ddd9747c86ef97ae1ca441bbc58db3df6a8643a4b37d7d5b4. 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/QZFYY1940547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b15de7346b5fdb992f95e6ad8ea31bd082a253d27d210fc36b700db572ce4c. 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/QZDA52011788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e09f4637addb662a57043405bd6716cbf252756708c073b5d0be70e81765d9f. 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/QZHNB2007156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79d256e0d74b7bf5bfe208dab81d92187f70ddabf3fed514039ac9b6bca35ed. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ITE2A2200344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7f3307b1dedb4415578b7ecfae0c3d37ee664ea2231390cb42341fcff0f8ab. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ITE2A2200345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55f8094ef45d4f1c55b64adbc0f93dcb928385c963424cdbee46f920478624c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/ITE2A2200346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442539d9772b40a8a42c06ce53bef58f50f9507569b44ec73104ca4ac6611efe. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/ITE2A2200347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a613da95652360f28681a9859f68aa7f4b335a9d519fb7eb9f6c2ff4a81aa6. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/ITE2A2200348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c386afcd80386000f1931976e1415dbca7e91bd7150c8ac72b4abd4cf3b545f. 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/ITE2A2200352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b1b3177d568ae0608e3664cb3af1bd2a464a49584913c37240de9c64818e63. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/ITE2A2200097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357f8afce3cc986ec80d3393f4c5977dfa2ff9c228216e2cc692198b3bf92c80. 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/ES71G2337471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809ba9e14ada39dd2a926162d12827d0dd0e514b3fc46249fd15fb2029579c31. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES71G2337478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05064b712cc7b296edda1e7a4e7ae326f2687d9f44c8c96b2826af7e16305428. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/ES71G2337483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1185e9bd79e2167d18fd2dad3744f03c10106741942c0effa0c952777946dd. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ITE2A2210145.