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 0xce3aae82c570ddefcd6efec16ef1e9aa3aa26ffdcacff330d22a6f4db09bbfca. 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/644bb425-605d-45f0-a247-4e04ccbb5fd2.json and https://artists.proofprofile.net/proofs/artist/644bb425-605d-45f0-a247-4e04ccbb5fd2.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 0xebbbf6c05276d5f61db33116b63e03b571f061ee1f1b21cd2589aed582721b4f. 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/QM24S1918949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7b721e83a626ca38fe8c158f1242b523d4acc3202516554d2196087a4f72ff. 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/NLRD51968415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95f7d94a6d323147f5e930ae086c31b39312b4b5f855436aaf8392d3636f51e. 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/NGB132300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1691bd374d818138ed1690a41d43210824d6423f4e8669e4dc9e8738a4d7c2. 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/NGB132400138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93299dd6125d39cc61777378432dac1bf0afc4a8c44a68b2e81a80bbc101f5ef. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NGB132400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3cf1fa12052d04ded6bd045a2ff197e4fb70a5486edea429ee36187c57ae6a. 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/NGB132400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00681538a03c169075f679a06a07de7356917c1abaee46b5356246f6772ac581. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NGB132400123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93299dd6125d39cc61777378432dac1bf0afc4a8c44a68b2e81a80bbc101f5ef. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NGB132400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4459ad51294bd312d6929ff0291fed2d86ce246ce3efd6b99bbc7d3c062841. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NGB132400129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95f7d94a6d323147f5e930ae086c31b39312b4b5f855436aaf8392d3636f51e. 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/NGB132300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3c898879afb938a9a5e56e77e41c3bd9b9b2b1ef5c7fa93b6211a19281412e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NGB132400135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1691bd374d818138ed1690a41d43210824d6423f4e8669e4dc9e8738a4d7c2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NGB132400138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3399acf1ce72e68fc8e41ea781b98e435874609d3b1b332f077f891c077cfd3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NGB132400144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826b3d5c2ca5e162ddb7114a3a39fa3e9337b283584a518933e4850098833d38. 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/NGB132400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb6b2a6f2924d878d54ff8993812b7e145f9c1fe3b0f8edf7e9f9573e5b8416. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NGB132400153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3a0a95401d02ae117ddc3553f84c631bdc6d821d72eb1b7440c3797383c440. 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/NGB132400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9e7da09db5022ef06c01ed70a328e10a2b1e316b07f5d772cb0c07bf98fac5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ8LD1950103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655eb0d9d59524816d2ab823c2b35d8f6bebb159444885f4cc11dac1acd3df8e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLRD52024364.