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 0x72ec074a757ee238831c8b30ca8bb24387062f1783074edd354454e1e337ba5c. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/70fc17fc-87d6-4b66-87ce-a50a5d76964a.json and https://artists.proofprofile.net/proofs/artist/70fc17fc-87d6-4b66-87ce-a50a5d76964a.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 0xb33240e659499f7b8c79ece61e06c95be6fe84a3e8ff13a280822e755db20626. 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/ESA082313970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b388a3b1e9e581e33c5f27e0c9a7d136428a8432d8544bc71686bbd2696ac42. 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/ESA082313971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599c1e18652b50506ff3eebc86986069ff557958e76a43f57c38c22eed3ad1f3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/ESA082313972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5792e205c59de73fd015374c3de3d0c8aabd9c01313484ac4b82233ba23f76. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/ESA082313973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3591e1fcbba46201a57252b2ddfa0e788c9602de0f78b8627dc81b40e489669. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/ESA082313974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf741f02284ff780b34bdab22f4bc9494138997ff707afa5ceccdaf0f6be4493. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ESA082313975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a02ab0143d6263587803089daddcd2a3dda13c36a49598e779a62ef2150386. 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/ESA082313976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cd659d48e56c2f9e5c07caaa6eb5f4405aa1a01b83cec84f8161cc56696106. 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/ESA082313977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3463323bfb55792e0f364c947db23ee7e41c81d01eb57fe74e2824f842a7f5c. 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/ESA082313978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3b87556142773d83a0f76f408c45efe2041e3543c397fdc4ba4243167126a3. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/ESA092411869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ede9896d66bf987b6a90dc2fb7129788ea66d9a30dabbdfea2fd6d78d53cab3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ESA092411870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a654c1f42fa5171df70b8392b5c62018e9c72fae6b6158581fb480651df506. 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/ESA092411871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a42162313976d1abf4ad65410146fa6e9660882b6d702f9926de0df821292ff. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ESA092411872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43de82f7ddee684cd922b0b026eeea9bb43460b4b039a5c5b23aadb56f74fae3. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ESA092411873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb241d34039dd526769ce9a33ba402c7ac819565a46ef352bf4240192b22d049. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ESA092411874.