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 0xc8288e5d94e89d0cc280064ad6913e1e6a1d468cdf05cb2790a78e310823dc96. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d426315c-9862-4e95-b054-91f4ae7b213d.json and https://artists.proofprofile.net/proofs/artist/d426315c-9862-4e95-b054-91f4ae7b213d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cantigas de Roda Populares e Inéditas, Vol. 1
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 0x8d7fc0e63607445121be3e83103284a3617406901dd5f4474adb3192cab9c657. 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/BXA5A1600037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50a49142c876b1212050bb837954f05dc078b6a0699b6309162b0c1c5d1d7e1. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/BXA5A1600045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11de3ffa5e593e326c49aafc5b3cbfb23e697e0b68664ebdb8a4d77884aabd36. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/BXA5A1600044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4f02a0d9e5ff93ca2be5160846b7b28c150b00bff6a507b3858e0269db405e. 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/BXA5A1600040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4343c54430eae0870b2a2871aa2a1e4d64fa0b15c9e274d254b390fa0ce2a10f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/BXA5A1600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3562a9ff3583b75de725d3c00da53c091e0c6160f32686c273a89957d2e0de4. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/BXA5A1600046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d7e825f89d2dc7b9542f397f55e8e43844067996adc1a5accc1f4b0f2825e1. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/BXA5A1600039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7b7c922cf0d723b0b6fb9b7f9a58aedf3b3b04417288b2205c8e407a4d8e3e. 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/BXA5A1600047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3669e5331b6b75ccb2cefc61433e35481572bcd069a15a6682c696e4c361da9e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/BXA5A2100008.