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 0xb385dcc6635b42447081d0a97feef7e6f96e8a13113742135306d2f9d3845ab0. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/842f8f05-1d6e-450e-a63a-d32ac7fae0d2.json and https://artists.proofprofile.net/proofs/artist/842f8f05-1d6e-450e-a63a-d32ac7fae0d2.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 0x56dbd59a515f4892afd3151bd7bb59af6663649b7ea320b4f8ac37867d15a9d9. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/QT3EX2432974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc9f2dcd9e7e12709a55a3d1036f778d455d63c95eb958135ed47cf6a308a2c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZFYZ2552570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12822d8b53a48d61c67ddf60a58533a929a5799def75be240d48e8b677c9f7a8. 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/QZFZ42562249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28eb87f83071f81ebf6d314a03150270608d314e1c803f3efc99a4315d96f9eb. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZES72565859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cbdcb0bd6f99c6ae5e58faa921c3d8c27644a70c88029fd5d9db1bd8e938311. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHNA2532888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32f6f333073f07639fae4c19ee6d6a61d419b193464e9ca77c069fe8d715af8. 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/QZHNA2520044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f889df7760bb49eec24c838790ee4a2509d296783565ada50076e858bbded31. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZK6N2596935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8167924856b3c8cf6a871060db9244cf6acaa8074163386973768a786a27b63. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6K2583134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22c6c593d7386c29404da58fc25ecb420793e5141cc4858383a0d51377b1694. 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/QZTB82538406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830585678010234267580fd9fd33848dc9e5f4912c16b67ca0ee36589760bae6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTB82538407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e588acaef8579605b1d5330abe528a2ee51580445fd856de2904cae75ff094. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB82538408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaac2f3cd0787e7d92750e2b7a6072e5bcb55b7ee260740638777a4a1ae345cd. 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/QZTB82538409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26475bfa03da53dadbc2194fd9f7609838c110d68fe218878c833234cff7c3e8. 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/QZTB82538410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780a4b1345e34fc3bcf4d9c456d682ed5b700f6181f2aa45b4b10bfc04b7ff45. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTB82538411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9955b1fe633571c3faf7b58a10a4ecfec033b8a108a0dcf3a4edb65e533f8c9a. 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/QZTB82538413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b0b7a2736b7d2f72748ac4d881f79c3b6b2d5639b802a52d0c3639c86c9648. 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/QZTBC2582719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09674631b55b3955416853a5e5922dfb3ac5e8deeaa4516ffa24e157e8885902. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZWFR2565492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc022d9f301b7424e0d83609c8bac0a175eef07e1018f02f516d719f1b290cfa0. 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/QZWFR2565493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f63942bc2e4cbe20a8160e29896ec82122b1370fde5ebc71650a53e8d78bba5. 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/QZWFR2565494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4068036a234d33dfa5c51249228c4f65ca36a277b54d081e1c593b6c262582. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZWFV2568272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3364d242a784051ad36a9089afea81c6a238f98c22c6ef0cbb0f7c408f4b1d60. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ7K2522377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9363b0f44c83580650e4837cc47290de661211bc40d3500b6a44666864800af4. 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/QT3EX2511805.