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 0xea8a89fa5360b0f310793d1f884d79e732077d0b23b2917ee6eab49ce4a73972. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04cbdd80-3a9b-4823-b8f3-ff6430d783cf.json and https://artists.proofprofile.net/proofs/artist/04cbdd80-3a9b-4823-b8f3-ff6430d783cf.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 0x8051878b506a55cc0e10035ff976d441aef18e03e2661bed674836b5afb8e807. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/QZFYX2241906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bf4654c6890156ec8eb10366702d831f405652b998fb0dd6cb74ec7062945a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZMEP2157255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb549648aa69e170c4128660caa376365d2f1c0d3e3392b078f8a312192829326. 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/QZMEN2191795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22376b4dd93ceba3ab19280576dd6daea82c7dc5ad06e9ab4e00c2b28f83a44c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZMER2187366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d0af0749c66bb2d7ff98288f578d7a4cbc2c0c0f644a08d674f314f8ef052c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNWV2110862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d0af0749c66bb2d7ff98288f578d7a4cbc2c0c0f644a08d674f314f8ef052c. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZNWV2110862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e76c3d3ff1482664c9adc3538e452a8a31bda75ddb8aa2c14238d07103c9581. 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/QZTB52337470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63e9ce0538388ad89eee79b0f8ba4b268b3bc80702caf618c11972f80076a0f. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZTBC2381339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2857c9174c6e3f373e276d56c9d83acef60a31ea36860d1a3fcdb65f5232e1. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZWFS2321681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0421bb041defc7c40275a49c408d121866fb3e9c557f59f3f8d5c9e830daa0. 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/QZWFS2321682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e76c3d3ff1482664c9adc3538e452a8a31bda75ddb8aa2c14238d07103c9581. 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/QZTB52337470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc6f9d48a638a9d0b6871141e91b006d21a26c680c8f0bdc655b7f277d15b31. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTBD2432639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd4a64b282af504b0b7337934c28191397586dcea7a43fbfab0c29476d2dc06. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QT3F42411074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2957eb542e1265e904261b39913cd293b0346972a7dc9568406007d4416031. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/QZK6J2580454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeefbfbaefc79a97cfffd66820edc483967be827bdb9514198bbfe635d987d942. 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/QZK6J2582562.