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 0x325bfdbd7e875a25a4233453783ca6b000bf75c10d8608ba69d18a217a8155a5. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79b37873-f3b6-45be-a34b-3af1925e84e6.json and https://artists.proofprofile.net/proofs/artist/79b37873-f3b6-45be-a34b-3af1925e84e6.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 0x9743ff322034d950d20e04303756a4d3b6056ff3fe52af3738dc4c61772bf2e7. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/SE6I32451004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3088f9403b3665474917affe64fbe8c6cf0625a351a8a2e053fda2f3d23b0cf. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/SE6I32473809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eabe900a1c6e15117281586e63d6f5510bb446b1c0e0ecc2cc9ec7679929b77. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE6SA2415591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f6bfbc4a2213e9d8cbdbca54b3b024e993084ddb445d1be72c0e12b00333a7. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/SE6SA2454013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca1620b85445b8491fe0839d88b191430baf697f6f608160eb54a2e4b71fe3f. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SE6SA2466219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f6bfbc4a2213e9d8cbdbca54b3b024e993084ddb445d1be72c0e12b00333a7. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/SE6SA2454013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eaa2fde55b22144ff0e27f6256315b10802a279b8be990442affd0c448091b2. 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/SE5BU2561543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51e60d1c6c799d46b00f8e8f91517a4e92ec360d1ca02012ebfc9bea617a0dd. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/SE6XY2519143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbb6554dee3bcafef558d35c27795ab61c48be1cdfadfe687b376ec773d3bbc. 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/SE6XY2525260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3f36c6c978839aef0bfbb37196f17cf5262bafc8a5ca865ddaff3a4b7ae091. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE6XY2584904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38fee97cfb569e4f97155f34fc12a682a3a9b2c6e7631aed8002b6f20c8bae2. 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/SE6XY2598666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb51f841c30e7837252ba6f831075d2886c31ab58b35d535de9d16b34a3d9ffc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE6XX2562051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3556fdec4560b5257b433be5c8cc639af2382463ce69296cbdfa6761536b74e. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/SE6XW2579828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5311c686f2a522599ba1447838e9feb5f19fcc171b75150e71e0077d15b49518. 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/SE6SA2563236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4eca9729fcce694526868dd26cd0fd1baaa0b674f7f269aaff8b796352671c. 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/SE6I32512275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f03d02ed74368534c85325ce7817a44666301a46156b1fb80fad716c08b6a75. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/SE6I32551360.