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 0x0d79a52cae36f47f026382846cbf7b08ba106b978312e95cb94cb1e6e91f2924. 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/ccd74f96-3c29-4151-9c72-5dbd4f1dac2c.json and https://artists.proofprofile.net/proofs/artist/ccd74f96-3c29-4151-9c72-5dbd4f1dac2c.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 0x93c44a91eeb8de924120e90ec2daad4f1abd4706248019c7509502c95ef2348f. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZRP42494253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308d44aa27b7b7ab5570ad8653f3cea2437f5d0fa13b26c8c2fd2954c38ebc52. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/INSN12502043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050bc94f22a3e173e2908ae6d0362f74aede46f74af964658b20027edf6cf9ea. 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/INSN12502953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e80045bfc881dbb2168bc6f8fb9cbfa732e91d76bc2fec3e6e23109e9ae9816. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/INSN12502954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3ef3658a61e40f2fa9ddce9425c104f5068b52aeed3830ef560ebb291bdfa2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/INSN12502955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5b3df852be4546427cbf6404865178a9cc7f129644f9fedc4e70c5386ef91f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/INSN12502956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5019153340b2637bedb1ebdae34c47f1ad11c3066d41b3ef9ec73386d849ef. 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/INSN12502957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95203bc65592e81b7ae28fcba651febe1491790fb286d5f5d85f5e667f3c74aa. 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/INSN12502958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f376be06f2ff99037759e7bf426e244fde4835a5b12f4ac6f2f3952a5c9eba9. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/INSN12502959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fef56a9d865ebc954eff2dc368664cc8be0629765094b0f5c929bcd72b2ee26. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/INSN12502960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275957095fc3ad530120a84c178eb5693f947ff6ee0528b9954da8434b6a7239. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/INSN12502961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca03bd4056d5e6441f79c9d6f8552c2b594eea0cde7cd0b03bf6f4ba2976064c. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/INSN12502962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf31acd5fe64194406fdb56141dabf462859c0f5f16ccf465c7e120276263e6b. 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/INSN12502963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c53f174d396b39be67ee82bb399e9b5791800c69a61ea8a141d1bf32c8aadd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/INSN12502964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a37e25d3aaf9a627e9f76c400b0925f56a7256b05d0b5fda7aa5607c7e9d1d. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/INSN12502965.