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 0xb8d32e5d0d56bd58b3fa8e0b82291dcebba6a0ea3b87cbdb99a781ea8df5d1f9. 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/d71c5c59-d916-4e9c-85a7-87b8476116df.json and https://artists.proofprofile.net/proofs/artist/d71c5c59-d916-4e9c-85a7-87b8476116df.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 0xa4ab5491d8b20e4b530a0d53c39bccb50f18cb0e89502211e81d0e95de0b850c. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZHN82066520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcd9c3ec912ccc0c90410cfd1e84228aad2d7d79df0c8733ad8923f0c88a1fa. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZHN62162191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c4f807cc35ffa5a53bbc273ed0cb47d00c4f94692e4c5e39a546ed25b62eb5. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QZNWQ2120684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9796cff389a6b9ff5b8db7b61eb6233a3a931480c78f603b6bd8ba7f8cda612. 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/QZFZ62297157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac70546e4cf3c220c9173276b25cc616a7a203b62760cb4033266179feb891e. 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/QZDA72201840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9c9037d7e8583ef5313d5df9c8e8230f1632383e98ad001642b8cb42248afa. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZES72240200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9c38e06bf3dadb58d8cefb1bc8f926aacf49167e1d762003158b4cae013c01. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZHN92221922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5172fac445e37a18854ef1da9db67b82a333da4703ca41a0608587a1539f814. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZK6K2229757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6533ae26ed6f33a9fdf7067afd9f7c58ebe54301679b7672152e831f5eca5103. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZK6H2280573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99b5893f8e9ede9ef024746ffec6a02969a3fea6144695f6ed46013a5c5d3ee. 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/QZNWQ2248092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b0e764c3b40c77555f174ea6a5e1be9ca96054799bd9dc89aa6a00294cfafa. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZPLS2244879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e80bed9da2cddc5dcb21f63e1076a250e6f72643f1e46a87d49ea780033cb7. 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/QZTB82219932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151e6f508695f3699be541db5bdee266fa4948b60e8cb3a22a9ef72148097d35. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/QZHN72323377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35cd0d21850eebf9c3bd2170801f491a422b63b5fbdb5701ad753f0d26c8d98. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZES72341789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370fd67841d1e6880625504739c582de4c9bd3384362f25cc8c32e410c271694. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6F2340486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ab24c6dc7037142efa1d1ca1c69519b2d1dfb1bc2106aab2fb6cc35441fea6. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZFZ22334109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d7ea9ea76410697196fec4332e718a10eec51a6a8f3b70e195fb462d22ead8. 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/QZFYZ2413641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0dfd4b592bcb752b161349ba9b320fbe3ec008ca1dd62d78eae1287560d2d2f. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/QZDA52430789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8b86aff7d1c8db2633021155a039ca703f9062a389e3a071abdf3be9f42ab1. 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/QZNWZ2464603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e191e5dadf409afc8a42b31b56a47b8d710b8f689d43fd27cadedf341a0d50. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZWFG2467370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed944c6edf9725bdb9fe41519c15ee07aefb66f07c7fb306a8f05b01df4ab85c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZZ7L2496621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f63eadd689d257331ef7922c692532d77b043c96d3c25353b8e0d151103359. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTBA2582123.