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 0x72db6284bd8bfdde588b4d221b338cb1d3809c328cebec7bc6db1ad92b85252e. 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/2e3732a3-1948-4a6f-ad0b-d014726b1a85.json and https://artists.proofprofile.net/proofs/artist/2e3732a3-1948-4a6f-ad0b-d014726b1a85.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Twinkle Twinkle Little Star (Ukulele Lullaby)
Twinkle Twinkle Little Star (Electric Guitar Lullaby Sing-Along Instrumental)
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 0x76dab74d9a332e267b23254255f31bc0a6ddd529dd5f9bb435e50733e540a3c3. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2326715 — a six-check JSON result.
Twinkle Twinkle Little Star (Electric Guitar Lullaby)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d352de1ec677789e077ef16dc714bed09271696410771247a52533b80fcbce3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2326628 — a six-check JSON result.
All the Ships Are Sailing (Acoustic Guitar Lullaby) [Sing-Along Instrumental]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f364b7c6c9f2a64d609a472b05ed39ebaf15376bef92c42934a20f46c1cfc4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2329659 — a six-check JSON result.
All the Ships are Sailing (Acoustic Guitar Lullaby)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8aeec9f063043cfbe925e819525b034f7bdb4ab3a15d502b846e9c5ca10656. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2329658 — a six-check JSON result.
Till There Was You (Acoustic Guitar Lullaby)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afb6884ab51ebc9ed5c6bf7d6fe575522121be77c2b424fc0ba2af0bcb10bc2. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2329664 — a six-check JSON result.
We Three Kings of Orient Are (Acoustic Ukulele Christmas) [Sing-Along Instrumental]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98f49bedb6ce3ec7083182e19e8fb9beebee207d11332c5d0809e1d2d374153. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2329662 — a six-check JSON result.
We Three Kings of Orient Are (Acoustic Ukulele Christmas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81be99dd4d6d60a9477fdf72b28ccbf481e32d0c8afae8c9ef48775e54b1df64. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2329663 — a six-check JSON result.
We Three Kings of Orient Are (Acoustic Guitar Christmas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6298c66e9a995c859ca8b14b977361de6287bdbf6940972439fba6cf5cd8ca. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P2391216 — a six-check JSON result.
Rock a Bye Baby (Electric Guitar Lullaby)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a122b187dc143f50f5aec06d262b2facb135bfab2d019bdfd3ac72ffc7cea22. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM22416116 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0bbe5879b91f2329d8e7386863c092899a74f810f9f2a71116144a2f18b359. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2461409 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efc5ed274e22ce6741863aa5606d7c5213dc87077dc3507ae5499198ca69071. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2489938 — a six-check JSON result.
Falling Fast Asleep (Piano Vocal Lullaby)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed14c72211e4f8585e173f8f4ea8e442af1fa00c35baba2144f445bef46896d7. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P2459537 — a six-check JSON result.
Goodnight, Sweetheart, Goodnight (Ukulele Vocal Lullaby)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce58638c628c6e2a7a41b54bd10040d5d97c00970b414c446e2fcb8cd76c0b9. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USY242413879 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445ef5f07de287e37f7844d0bbdcaf060af84d461ffbd6b3a76d6749a5a01ed4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42580095 — a six-check JSON result.