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 0xdce2974f34adcc8d7f9dba1057da4caff963e2f63cd7cb889e1c6d27e4c02356. 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/09f0696f-dd5e-47da-9161-ad2a9029551c.json and https://artists.proofprofile.net/proofs/artist/09f0696f-dd5e-47da-9161-ad2a9029551c.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 0x2b5daed5612c72c7748dea6f66b3d2ebd60995500506bdffe13e65ab231cb7c1. 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/QZES72103863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1e831838c062700263c1dc0aa4d4ab493f8c0e067f61de5ab2ec38dfe5354c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZHN92170124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3486ac28c5cf4cecedb836c7dddf5a5e2912bd226cd16bdd8ed7a50f2f2b74. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZHN42250584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8399aafc82cbfe16ff5cb9c5444c636ab267992b8a277cceea350db06b0c0c6f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GRSTY2300600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b9dcd97bd1b33714153e05440e6014c01f03e24d7f145410bbdbceae06c4f6. 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/GRSTY2300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d16e1031f6495b70dc502be4c4ff6183500cde7e176b13113ab5b90cfbf216b. 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/GRSTY2300602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad22e7af3df395231c9e80d6d3d184bd4605bda0643737a450e03512a521f03. 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/GRSTY2300603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf007ab2e20b56faf96ae8a3177f191c5ef31bc789d8b8af6dbe417ca83b870. 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/QZHN82485491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a510c8716eaee1dae865a07094a356f62a2a896eeff542fe6eed44527b200f4. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZHN82485492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff97656152452de3fab7c54d2a0fda4c38fd3947f370869565b3eb31ea25fb5. 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/QZHN82485493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5e0a4232cb8ad3f02869b306f218407d9bcdc938db1f0468bd1818a4be317f. 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/QZHN82485497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3e01c340cd39be4d72d492e42d57ed7c9b7bfbb3b3be1771198b7c5a57a19b. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZHN82485498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c34c3f3d7689d97dce20e80bcd333147c1577315c74d7c82711ce48674ecd3. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN82485499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3150924fd0f8218f5006d3e91e05d951665c1d730d8cb15364a23215874aa784. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZHN82485500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73afd0cc05ea83d2cd3db51169905f4f668755f3d0fbae1b6c14edfd7c06bb03. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/QZWFM2475845.