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 0xb11e2cd543e072b1cf3b5905de0f16dfef8a9a19fdd2a81b5e9998c3880046fb. 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/8f64f360-f4ac-4ee2-8939-6c7baec34bd2.json and https://artists.proofprofile.net/proofs/artist/8f64f360-f4ac-4ee2-8939-6c7baec34bd2.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 0x5a2a11edd42e22b4a4b459503fafe4b62572f11981933ff3eb9f5cea1050a307. 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/TCAEU2087306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbab3667673759832d7e62ba56ab00ddf084ca8b678e5fb0276ad47e71dd8ec8. 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/TCAEU2087315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8ed5a59c2a68e1d1a6293c4e5313aace3915fa49dcd7dad3fbaacd51940911. 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/TCAEU2087326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8431159e0beb1fa56feea0c3b6601eb1ed9a1de97aefe5e91b23a7aa77b6e0c8. 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/TCAEU2087330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f18753f6f0139c51ff700da5ec20cb7edda4c3bdf6cccec77ae04ae26b8ddca. 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/TCAEU2087346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b993afa98482654328bb73e86e1fec44515251992fb5d05828994fb0c84ea30. 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/TCAEU2087353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d1fe9f7e4a272cd6f7ccb6e2b6267db37add0e23b154a5657d357b36f67bb3. 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/TCAEU2087363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e79ea1a18132e7ce63665690599865bb21d044a1e0e2cae5edb856176f7316. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAEU2087370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b12f96fce573f8bc3e569bfbe2022b1d9e19843f90daa1b1280571bfbfb6050. 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/TCAEU2087390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc52f0bd34d0446b34c22e0faeb37f31cb59d4577080d4337d0c48edb6dbede. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/FR6P12303190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ff34791d7c9d914aa765b1b20bc9b8354f49a2b47a4757c07f6137441a99c0. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR6P12302750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa808a5d14e309d960e9ed236a549e90847dba87f0cb7ff18baf2fbb5e0990892. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAIB2486297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69654e1d3d7bf3568ee47d3c0d641f83837342380e36bc1fb818b28b950df2e. 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/TCAHZ2460734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c4dd799647820c1a2ad9bed4ef9304d83eb08a5fddd24761612d5ce877eb9b. 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/TCAHX2401595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525cfa564ce91faf8d15c464f9b3fb70b0e198bee9dfcf837e3c203f1049066f. 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/TCAHU2405864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdba2b9a666b9066259082a0271a4313241e332a935d7ed98c048feba80079e7. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/TCAHQ2399718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73686bb4ebee58842574288936ac1f2b8c73c63d2342921a48e8180891a79a4. 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/TCAHO2391585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb71ae7af29022ca6a19adaae2df1ff76cc0f8ddc392b70cefcbb931cde9a35. 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/TCAHC2315101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3932bc5d358f1d3518d6466965701dd3fbf0967705da14893f5363ea14aa51c6. 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/TCAGT2388996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632933a96c6032691c96e5c6d2f9d4745f768fe459806d0d14565e64a0ea0556. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAGN2299788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f3cc82b1d0766d860d5bd4c3331fdcfdeb48c19144c373167d29c3034aab1c. 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/TCAGF2201668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d30c4d3358e0ee1e5edad8fdcdb0ed8047a3574f0090c258f95e3092b90a10c. 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/GX53U2054441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d85f7c97e0d126296caff73bb387727d1114d84cc2636f8b029c43ac66e6e5. 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/TCAFD2075859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1de4a3d2167916540a9e94af23640a99c953f3c2fc24c81629506dbe5e24114. 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/TCAFA2026693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659feb7f41d79d4a1cda449a9bdf1a275354686a6b6923d99d717ca4f57a464f. 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/TCAEY2060884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab89a247f5f4cb2c44ae000e54eba3bce0b47d81b7829f1e6647f66ce1b9edd3. 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/TCAEM1945165.