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 0x71a4168c046629cfaa82e90f3bf30bf47443fd20bc2df22727f2c76595dc2531. 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/3bfc1e82-c96f-451d-b5fa-783fc2d1c968.json and https://artists.proofprofile.net/proofs/artist/3bfc1e82-c96f-451d-b5fa-783fc2d1c968.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 0x3320a4f422b926dcd37c2ef9ca112cd48d52125d03a6e963661ec8ae2d9f8039. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZMZ92095771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f4ad81cc104d63fd66e5eef42a58f952f83104dee997d2d11db6f123b843bc. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZMZ92095772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236036e5e5a96db06932c20ede711a336fd87ad7651565de88e955ba758210fc. 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/QZMZ92095773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293c44253155436f694af5e2baecd8f778c8cca28357f8190c62a23d3c7cde4e. 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/QZMZ92095774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a71c56f02f35f8e3154cd125e0f3f1c4412133db0d2d9aecc2f75fcad89243b. 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/FR4E61901160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd1807101eafc50b9a9739ffaacaedf04b5e34465ae0c86894a6991de71f2c97. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR4E61901220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cfb246e1e8be5e3a3ebd318573b3e9825e2f2181badccd01f62080c6d46a1e. 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/FR4E61901230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4f9c53c106e14ff051749e5f34753697fd9d4a2784ab2235f2ebc54165c8de. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FR4E61901240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2b2ef1417e1f2b664603112e66eac457164badf732d4628435c93bf72850b5. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/FR4E62400860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f0ef412e96f96f1fc399ae1b4d8db361bece1e82ab4af2b20ef9c44244ad2d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FR4E62401070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3eb25fd524b7f9033b4e788135108e8632cb1b2a3da88e37fa4cf9e8cc5b2f. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/FR4E62401080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc65741b25eea7bf3a278021a24bf6bbeefa9a95e2e0cf9ea43b8a6edc41a26. 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/FR4E62401090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6834693c665016a32564083534cda8af7eef25e45fba34f57e3ce34717e6ed. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/FR4E62401100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0d737e65f69d0c2df45a572706dfbde3dc6d7ae49006e3bb55ec66be3b65da. 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/FR4E62401110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6957aa0c84569605a67a0fcdfc7df3d9a928679cd0192560f9df1d1618e2e63. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FR4E62401120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a0994a2978efc582c3b8845e16fa2cad1f6ea9ea2652432d8efbef64ff4c0d. 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/FR4E62401130.