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 0x5ed840387811df5ea5f66edc72d42efeb017cca0a4849da36a22ee2c5fcbb7df. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d73f6f3-b668-49be-be27-79569af53aa9.json and https://artists.proofprofile.net/proofs/artist/0d73f6f3-b668-49be-be27-79569af53aa9.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 0xefd2db3b7b0c0238ac1c1b4632635a4a4e1bdf50c0a9757bc90b406fd0cfd499. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXRFP1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ae5bb804e8b4204e79601b9e02780fddc9767d922e5b3e8892d5545ef0a0bb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXRFP1700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5589bea410f48728ae921f7ce323f18eab06cc5d47ea8126c36b2d49bad62721. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BXRFP1700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa450033294da074e7e3f9af4edc86a814c22e2410e586c7cf3d51b743ff5814f. 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/BR96K2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4375385d7600dcc01472d826b3de8c5fbd44869e0c615b04fe1b0fbfc2f32f3b. 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/BRUA41800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31439cf400e9f4d0203e852a1fa20b68d14926ebd7c43bda7b039759e717f484. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRXYI2300001.
Dandô: Circuito de Música Dércio Marques
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1acb44826ad0606a97ee1c395471ce54413bdfdfc1fad34d20df02c17fe7867. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/BXM8D2000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4dbe0fdf7a67c17063957df27c7e159d010c43f1686133eb21ef1f58fe32b9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BR6LA1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89bee0d0aea0aba56985aebcbb9b3055617fdb196acc420e04758937d9413683. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BR6LA1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b333127edbdac1684a0c4a79463a85b59a6c450f87be31d9b79448c4f77aeff. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BRXYI1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f121e16bda5beaaa06a36c583d99894269758f52624fd3c7656a9db844bc3e5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BRXYI2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6642b2be6be27e91a52daa05b4ad3b63000a42fb8c91176d76223292ffd3646. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BRUA41400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbeac6c3d7f630d817af8e12ed0676885bef110649a5fe3e2b5cc01ab5b52512. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BR6LA1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162969230507d3dc2a8de3724cf7fc6b47292fcdaf361a51d8f0932483f699ae. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/BKACE2200003.