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 0x1a07c2a279b22ee9d7b456243c9ce8291db72638340f9eb1d70837e7d539971b. 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/274b45ee-873e-4855-a4cc-241e6027498c.json and https://artists.proofprofile.net/proofs/artist/274b45ee-873e-4855-a4cc-241e6027498c.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 0xf44d28c06b89b88d156609f5b8c73a4907ddb7619a8ce16902780745d46a2e24. 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/FR6V80167937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b271fce0d5d31a146d29de029e140ab8fbe19f133c77d3b9cbdf055c960fba. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/FR00Z0100120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3442222851b100f4f1bbfdd03fa8b601fa9985fc7ca08e3e25f65dd28b2c3359. 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/FR00Z0100170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775f0cf9925b6339e60c1c6be86744628939123b498b8e598d3711780a8b5f0d. 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/FR00Z1600230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa0f21b86305106252b923cb394796c08141d5ef56c408f0c3413d04af255a3. 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/FR6HJ1718000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b0bab00c2ef32ae0121bba409f58ddbf1621f4e2e949f13a0f7eb37096952b. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/FR0U91701043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996752cf28d5abfad3b62dc28eb62df1b4247b4c7e86acef26898a09a2b3672a. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FR2X41904217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9adbeb776e2fa0ee0f32c8d3ffc3f23775b6f1135398cffd61f95b6b41cc80fd. 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/FRX762361594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510dedf2ebdf66c4819f707bdb28da715dfcabbaa945909e13269d50b2e48ac2. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/FRENT2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8754894b231af4caa68262341138a97b647b8d0f933b88ca2ab0f7bfe4ef3a. 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/TCAJQ2534738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47be8bb2ff8b683d87a29fccd076b3a04e7f6c2e547a72c5b4ea174ac3a8fcfd. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/FR0U91401965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7858b793477301d778ba1abbb6e592de116019e8616bebb4d70c80b132bdb5. 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/FR0U91500196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2ad3a3c54d34134c2b9e58040ca0eac330641605550f09c7fc62bcfe5e9b3a. 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/FR5R00912779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47be8bb2ff8b683d87a29fccd076b3a04e7f6c2e547a72c5b4ea174ac3a8fcfd. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR0U91401965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e8b4b91ec74e4bf05b976f558f9012273a865db80219e9e8ba7eb053dbf417. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX282145516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ce0e3378f77f6ff5df99525f03ac291d7ad0b0e5bddd6ce302a0aad36d312b. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FRIDO2414919.