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 0x5124a057fd774e329d2ec12baafe3364685f8aac3d840d60470da1741c042ef1. 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/cfe22fce-d66a-4a58-a512-2906ae8f96b6.json and https://artists.proofprofile.net/proofs/artist/cfe22fce-d66a-4a58-a512-2906ae8f96b6.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 0x8404a0b226d9e693f0ffb9d292b21c6d0d1b733d2b66bc07b82ca591f3c36419. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZNWV2088856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba46ba0cc7d8e3ec29f9b0a9dd7fbda0d458c502e7a10c96805316f03b6018f. 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/QZFZ72159370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd742364258f4b6d3acece3c746507bceeb15cfe13287643144f51aebd2abab8. 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/QZMEP2164720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf188a09e469a4ce3e002fdf6ae84f1a66aa00bab11dd958db729c6b7bb43eba7. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZMEP2164721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a82208ff9bf1afcbad838cfb7b9cdfcf2c3296cbf16c4586e1ec25ec7c1af2. 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/QZNWR2135757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f1e3c7ec58cb65398e90344ca5cdc71f08baad268f8ee8ce0142e56523a36f. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZRP42100819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1743205fbbf7305c98ec78b45f6816c286dea68b92afa3949a34bfeefc94d243. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/US23A1547034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cb4ea77f0c99666c84f72228970218012510b6d7b554f7b957b99068b67d77. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:08:57Z), 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/US23A1551376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdce90a054b8f78bfaeaebb13500ca2fefbf893d9d6638c398ea600fa4df7fd. 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/US23A1556827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1dd81dfbe3ed021bcae149a1f5b31842da1cc65ce2771452d6b81918b3c447c. 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/US23A1560841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62930128e142d9582cb1b9729aeb6d078fd094b3d3f0a9b324df5f0c3ea13608. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/US23A1565432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf316171ca178de6dda09528fc21556864bde5c0f70cce88e771edd23ebdad665. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/US23A1567471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b18ef17f2883539b13a86ec196ee910de2da5173f4388ef0f007515a4fef155. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US23A1582650.