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 0xfa79c2efa005e1978166a3a71feb7659e7877abf34566371806a2e8841517913. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/61212263-1846-4aed-b170-4c8111daf5c9.json and https://artists.proofprofile.net/proofs/artist/61212263-1846-4aed-b170-4c8111daf5c9.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 0x2004ebdb9e23fa6aef0b664cc92683ef1508d2e7490e25d5c21be677a45cabf5. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/TCABZ1435549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dd87c086bad0fbf78cbbb173563cb154ca64eef9bdd0f93b0971a46cd9d80f. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/TCAAR1021239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1838a176f4e1a71bdf38ed07119b4abe52afea2e603c9f2cd0be40c413a5ec40. 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/USTC90961839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ee00d2aff88d4a327eeefc122a782807faca3c83da33ee67db54f3a4a31b41. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMBZ91444878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83f538db7472f5adefa2c12e787cbf94fff7bee8006aead6c33c5c0ede964f9. 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/QMBZ91444879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cab2fb08fa1f39f242dec3581dd4d69d38505bfadfde56224ddf1e9ca22e31f. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QMBZ91444880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff0d3d59c3405e5510c46915aa9993f8bac93e4388cad486776fd3305aaa358. 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/QMBZ91444881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a96da2488cf27561e1a7cbf0ab17885d4846789bf040fce2ba3435823424e67. 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/QMBZ91444882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be9e5e6a44303e768d56906cd6731f7a847592fdc8322bf795651d928526d38. 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/QMBZ91444883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df7bea78ec27cc344d3bc2f97b58980cc6937eaf293bf048d5a08a20e0aeacd. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QMBZ91444884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10d6694bdc09edf1e9e84917524241798ab81a0267d4403cc53b1feec84ea45. 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/QMBZ91444885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42bccdca74b00df2a4c38495a16eeed3a795f5f8f3c64639c31abcc4037673b. 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/QMBZ91444886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75640c20cf0472ec65d18109d325eb8bc7d061fa8591c828122e779651d70bb7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMBZ91444888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe472d494e75101ff6e7dbc53f56b3cadba419d732cf66588426b338913799461. 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/QMBZ91444890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeffdcfcfcc4d757a7650cbeb4279d5adb93d82d23a1e122903531bce143c7a1. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QMBZ91444891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51e6e5c453f417678dbd1f1af10e1e2de9a16b55b58cac5cf44b457eef0d973. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QMBZ91444892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844b69556d2cebb6586cc1dbbfeb8fe5775fea51c07ee1459eaca395f28a141d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QMBZ91444893.