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 0xc8f9c1bc7af983dff17334774c572c575b457048bde2742ba1568ce0c8a0d8f3. 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/80b7ec81-1507-4f76-bb11-212bb09ea065.json and https://artists.proofprofile.net/proofs/artist/80b7ec81-1507-4f76-bb11-212bb09ea065.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 0xd82b4f7023576ff8420cc5a267eedb510ba306a7059eced81d5b294e5c7dc419. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNC2082495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc326eb4db2191781b02c55e32a648469c375d0ec9c8167d846651bd2109f2e5c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZMEN2094701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc326eb4db2191781b02c55e32a648469c375d0ec9c8167d846651bd2109f2e5c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZMEN2094701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x773100b429f5e334af0f3ede2f553fed9098143759ce11ef9092e7d8da9bab3e. 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/TCAEQ2081638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7757acc9fe665d1e405861979f4e707b7050ce74629c01fd858e179ed76ae2d. 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/FRR642200902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7757acc9fe665d1e405861979f4e707b7050ce74629c01fd858e179ed76ae2d. 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/FRR642200902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc176eb6b9472dc05e2a8b5b7028c0689b1c579346540a92bef8b88ba9e22f11e. 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/FRECH2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f77e3e3b593c8c60a8cf4c78f0cf5019ee00ed0c1d5297280fbdec4888a1c1d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/FRECH2400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25aabcd6b3282872e4bfd4929bd01fc4b603b799f91a4f6cce8fccea4368090a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:23:41Z), 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/FRECH2400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24e4b77eecc408dd3d79bddad95e6c5efe1ec3a9fa150caf757b9226eccd2fd. 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/FRECH2400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f6ab972f09b54a6b0c97e5e42b4371831e41624699b1c5c398701906d1cdda. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/FRECH2400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b13b8f88d084c845391232dc06ecc493e75ca073af5cd91c7b22e0192735320. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:25:53Z), 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/FRECH2400190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b6fbe4a8b7b288e1a90e78a6ee2ec7e34f3ed38ed35fec82f1248c2d120c8a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/FRECH2400210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e1eb0bb9974b1dc706a6e99761d309b7fb830d17a5720d85707c5648451580. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZZ7L2560278.