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 0x39994acbbcacedc19e9a35b5a50ba8a90eec872457bfa51e0468dfa466f30909. 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/0b7088ab-3efe-4d99-9e29-a411df9456f1.json and https://artists.proofprofile.net/proofs/artist/0b7088ab-3efe-4d99-9e29-a411df9456f1.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 0x2c4bf85fe80b283caf49ffeaa27ccd5af316f94e1057e3afebfd90e5f41af5c8. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/SE6132072755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11721def9b3bcd240efbfb2bf985371e5cfb17dc043167aa5a0b69cf116d8e81. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SE6SA2097003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641994aebdab0cdaa90bfeb506547a24ad6981edce243caaf46615a08b01ab21. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/SE6QE2163778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b2013aafc6f8d66c4b24777c69ba62e244a40628eba089f987ac6bd9a34cd6. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/SE6SA2214863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7755f8d36645bb204eca8903016545c088d2b41af5172d03f0925d7100d01c01. 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/SE6XW2266452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac7483f2b0857b5c1dac1a114f265cf143533d66c797c9c0f018f44a77d49db. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/SE5BU2394343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344b50ac8f12795b55c6b1babeae55bc9268cc77332255041da55325b47f68c5. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/SE6A92352381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4c7ffc0deb504a184c4ce49de34a2a876fd87a40e0edae9ccc903065fc0f0c. 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/SE5752452194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b687d0a046887ca4190131684fa79948b04fc51a0e457b44ce7d929a8d2909. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/SE6HN2428530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a17d4730bb4d6723120b302a4b6c28d3e4227cad471afb4cfd3cb82efd1bf1. 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/SE6SA2446918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f11eaa8a7db1baee251151d33b3352a104d5325cb46c5496afe81621a10df5. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/SE6XX2544259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082ba6665135720b3fe4d1dda7393555897e00bc5632c47221e42b9fa14b701c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SE6QE2514137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0621c584e317e5d7fcc2f31bfe344f12d21fc2b09e07b14c4210287b2fc7246. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZZ8A2407777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29ea3414e00782ad9c3a76a13119021627fdd8492bc48796b8fb489a8002c1f. 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/QZWDD2481440.