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 0x801bc3805cbfadacd33b921d2b9fa107bfdb67c7476aa693f08724e0ad72ed5f. 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/ad70ed93-e078-491f-b585-aed992f92745.json and https://artists.proofprofile.net/proofs/artist/ad70ed93-e078-491f-b585-aed992f92745.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 0x119b965835eb2f17dc997ee94fa1ada93024a6762574f78d6f927d0e9c33fc23. 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/QZFZ62013832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ade4742a7200d8885a4a0b03d4d8f97bbc15bf3eb9b51eb8d817285c6f70def. 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/QZK6K2065555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70954738b8fa105779a629ada2ad2c0e971a9663664c59e7c3b5909aad6f948a. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZK6K2065558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51b9917ed3589ee2eb72221404ddea8da8cd39525265811bcbfa58e621f8a35. 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/QZK6K2065562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098d29666507a31cd88c31ceb3057e04454b395b5f13710a8c643bbcac971a6d. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZHN92158402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81000d38ec850db927d3353204f0e6cb61509fff8679398a1cc570e6a4f6abc1. 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/QZHNC2171031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e97699c067d20c3c5c2782210a70e73f7020d57262972601150897f57a8127. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWY2123718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3634daf70e10fb6b5e6eeafc57788a3ae4ba89809d6d4a2b53d1481373407aed. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZDA82285660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528e89db85dd100fdb655849d359078c321f8de5001da6bc062dba767564db6f. 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/QZDA82285661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ab1a51b7f0dfe691534bb06d4d1caf7b018ff390a655b2080ad98c6ea06909. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZDA82285668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9850528735b6fdf81fc3ff1ff64125e89d9ffa338232cc5655bbad007c3dca. 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/QZDA82285670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1a8c9f60128735e02c41a01127596d25792dff78c5e17b1c0f3ccdcc99c1e9. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZDA82285672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637a2c5a6d1f6f2e0283d1c06b800527adf6416a5ca2157d66de47398b059d4b. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZDA82285673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0641ec7f6aef0f4503f36af98fbb204e7cd36563e36da0acfbedbfa5d995e2. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZTB82254973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6ec98756f896d5e939c0a37eea75c84e18813e9ff9191687beb9ecd8761695. 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/QZDA62347913.