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 0x4cd9dd596d49806bbf07c72a3dbd7ec4aae122743b38c7454d78fb47883a86ca. 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/21be75fe-5032-4e61-8d1d-6af72e98ebef.json and https://artists.proofprofile.net/proofs/artist/21be75fe-5032-4e61-8d1d-6af72e98ebef.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 0xbe5782837d1df41ec68490507fa8ca7cc5febfa5854c7e6424a58d58ed5e1ad6. 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/ES6081840207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa697fe65ac0f96d2fefe187846f6e634ed1a3eb93117f5390848b13ab8aca3. 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/ES6081641101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44aee07bbb7d994fdf8bebbf065eeef7f26d15b5548ed1bb7997c5e9d7fc6bdd. 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/ES6081641103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d91455d098d3dc76b35669c05a0a427914002894e853a534abac0d3f6fa1e5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES6081641105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e462d05354f413bb77d73fd6d407fe36022e90ee6f00e300794ad86d2991208. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES6081641107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ff88db55a0725ff60f4e5ff136249789a04e3e97857c6c71c854bf5a1a9ea9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES6081641113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe946f66e299e549f79459ebee3de723c48d0cf069471f2b457d4bbc5cdc00a6b. 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/ES6081641118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752072102874e283328c051b422844fd8a6f9e14514aa0881e469b21ac4824f4. 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/QZNJZ2469896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d241eeda1f2ef7834a21764191683df88570b08ea0f4278b90d70991f03e5b2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBMA22430251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f90fe6250b2b84026ffc28ca0f0844b955e11829b76ad4336fe25528de0312f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES64E2453773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b81c27b8b51ae7e05171b0f914cc0531e9446f4d974d5509ef789aa9f379be2. 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/ES71G2400240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b91c11c641e22ebfea95dd6297adb2c66e349b0009991da77aaa4fd12fd9122. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES6102323001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45ff84bee74c5fe1eb97b1c20a52e1651e216e62e7f58b34e9db7551ec5751f. 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/ES25E2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72ef7197ffb19cf7ea3cb69072a2bb5219798afe76b3f24abd6b5fa46c8a9ab. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2222548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d951fcb1ce87809ff505ddb8845883e9d6c9cbede87c6f425e0cba8e7b43b32. 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/QM6MZ2083180.