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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4233944baf755ffe1ec2215bbadcf36ec262c237fb6975b0795f9ef67a0a0b3a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22467872-6789-4cec-a22a-8a46c3ced7ae.json and https://artists.proofprofile.net/proofs/artist/22467872-6789-4cec-a22a-8a46c3ced7ae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dans Les Ombres De La Nuit (Arr. by Peter Mathews)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa178d8a1a9c5887bfff7db4fc01a6fc03fea2a91f28837e503cb0b7d620ea5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CAJ720857702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92483fd7a2778fdf1a76b914241e367feec3acbd576d50baf65e0fd6604bff63. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CAJ720857704.
In Dulci Jubilo (Piæ Cantiones) (Arr. by Robert Lucas Pearsall)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f084f26e8b01ea5a92a34d853eb2745b792a0f352230bdb978afd55b08e3ed. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CAJ720857701.
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 0x1b07ecc3748120c7b51f393a2575c3a3ca3c2a02e3ed2248c4aaac1a7b168035. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T10:28:07Z), 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/USHM91838045.
Looduspildid: No. 3. Sugismaastikud: On hilissuvi
Veljo Tormis: Forgotten Peoples (Excerpts)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9094addb197113a92aca1b931c8e3444d10269fff323c109da1cebce3ac68b6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CAJ720635401.
Looduspildid: No. 3. Sugismaastikud: Üle taeva jooksevad pilved
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db2054fad0010e9342b9d4cfdd3e6dc2a9030e0406f716e598fb296fba369c5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CAJ720635402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c542a46bfd6750b8c67b46ad55cde06f2fd0d9a1b1cb7ab75587574dd1493e6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CAJ720635419.
Looduspildid: No. 3. Sugismaastikud: Tuul konnumaa kohal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21a97f3723b7ba262c225033a7f476573831bf365cd4f8788e71a657dac6e17. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CAJ720635405.
Looduspildid: IV. Talvemustrid: Virmalised
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6042ba7d8338f3f68887ae732887e70b30f58e8dac3b8bddd12d47944fcf7d. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/CAJ720635415.