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 0xe3a3edafdd875650bf333a913d2533e85636375ae160ba8cda4e35f4f166368b. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c9a225dd-8d56-464e-bbe3-7a5f79eb101b.json and https://artists.proofprofile.net/proofs/artist/c9a225dd-8d56-464e-bbe3-7a5f79eb101b.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 0x6d99595e68a361ff97ef7517c2dd720292e532f05409b065d5d623fd2d7216a2. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZK6N1910966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d90fb696d364ac82674cde00e0155134f382206a9cae5f0749a3abc7514b06. 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/QZDA72078996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b2cc09e80f6b41570f2a72ed73e22338f6edefb06c4535204759334704284f. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/EEHU32000275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5d56255b25c58f0bbb31c9c60cfeb4645734abf975c23057a535d99d5aaad6. 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/EEHU32000408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c9eb83582e32bf8bed9a7931f5ba0e16fcae5f2ed5458b88b6cd9e6ca8a1e7. 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/USA2P2118240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d5a30fdf7e01bd86c7867a2c483d6444c418fe0a54bb96f4305ae4f0ae4f12. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/EEHU32000720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eafefafe210145bc2910b6b1153495e7a05105f01a7432ce9977ca6ac6fab43. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USA2P2151510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42308f77e1707eeb68317bb08a77520c1a97341dabb4208e21d5425afdb3472a. 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/USA2P2233044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a666b40bbc13c4e973be14b4eced91d3579e7665d9af95973a20e54cb111dd. 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/USA2P2235356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa29b60e7e642e85d09e4350617cef6598620902967febebffdac4dfb1824809. 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/EEHU32001314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d695ffddf6fc6594e62daa3b837aa1437142045733dd97b8bb0b12b53c0806. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/EEHU32001313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c6b8ec701e706fe488e1fea4b1b8277d87aefc4b3d8362d4304b17eb58d530. 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/TCAIB2412749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1164fac00cf3aea1aa130fc5f7681bf95ebc1375d05498ec9f3c68e5ff5d2e. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAID2421138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f9a4c7680aaedd97d1a07a9e37bd37832d04e259f6bac2192a3b10ce1fe3ce. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/EEHU32400481.