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 0x28d640f0242a6f73faa210b1fa877b69db39af34b94f7f0c93d9a1305f87fde9. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/428083f5-96dd-4eb1-829a-1ea073b46602.json and https://artists.proofprofile.net/proofs/artist/428083f5-96dd-4eb1-829a-1ea073b46602.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 0x352b065796c9c7ccc73a85d8d1c6a1b36ca4d07ca06c7b2d5402146852786456. 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/QZTBA2296081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c2a2061799beac4960c334156cf2a2984e498173c6c59182b2ef2e75457bf7. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZTBA2235428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe125d221c2cf7293bee294004ff0140b51f30701ad30d49b245a659eed6ec701. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTBA2235433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acc54667f6eda718b1c19cad282e30c49f700b7ed3e134fb67138317688ebd2. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZTBA2235420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94e7fd3ab2c388a4e572da18c192f2ee974b46b28d244a107dd635d66e7beb2. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZTBA2235421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805813fd788f94e1c292b1312d6785d82ea324cfe3f505e27d171ed371aebd11. 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/QZTBA2235423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986ba9c6ef29c1fc666c9e94fe71dbd791da156d4cbe048d775b315942b1716a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTBA2235425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db37b5e75bbc8d62555158f920296d53b7ca0166b013689d1d3212486a653a0. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTBA2235436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1d66378ace6a47f2424be0b3ce1a7779815cea029ec7f036570917918c5f22. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZTBA2235437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e5f3c3716e8c2037ee89bedc3baf4eed211347a43427c3d891b1931bb39c00. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTBA2235440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ebea5b0636e7e4cc11012392eb48a154a966d0142dd7c60e2028ab5d1417eec. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZK6J2524992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd345147dfe2392c74066b76fa71f5423b26b3111618b78da6915ba0addb48f1d. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZK6J2524993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d05a46f2c6e6edb1769b7413553ca6626e77fd45d06e5bf8372104dd6493b4. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZK6J2524994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0e90ae93ad549c2c96d0d841f748fa1c9534972e4106b495957a75d05c8989. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZK6J2524995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541d05e1453c3e93cc9c34ca231354727c4097b297130c7c0a79ef7e9b89ef78. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6J2524996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4684d8c0168fe444a121a8a31e65d2adbb1a4f1bdec59a9fbea75a5e23e2e870. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZK6J2524997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1347fa25c1350ea1378ba734ae89566b33373eef49dcabb229531da5feb54b3. 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/QZK6J2524998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2289832811cf739cf8626935029dfb390b4f65fd260b0ff7c7abbd41576af08c. 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/QZK6J2524999.