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 0x6bfe5af0339afac263a3f0a4493928cb3a22aec44a73bbf1aa4cd8057a2ddcb3. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4367a2f0-dba3-4be1-ac2f-edaee87afb01.json and https://artists.proofprofile.net/proofs/artist/4367a2f0-dba3-4be1-ac2f-edaee87afb01.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 0x8d5fcacccb5b4c3d7264855b26106a87edda93a9e30cdb220302efb19daafc45. 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/GBEYQ1629403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef052fd7b7b9676aa603ad19fa4e99569414176d4effa9ae46217d4c2f8bc0a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBEYQ1629404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0592bce81b6ef2559f69e8dbc4d837974379fbc86ed259345e453034b574f8c7. 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/GBEYQ1629406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be63a1a3b809184175d9860895c48581caa4c0f46bd5b7a77672a1d53861a6a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBEYQ1629411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24323c90ea35e3ffd99f28253e46bd8bf0f5d597ab48ec46abda071714b189d2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBEYQ1629414.
Black Eyes - Arr. for Piano by Moira Hayward
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264cac3a30a1ab08c9a0cdf13f84b9fb05b23133289c1ca55ad8728d448cd87d. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBEYQ1629415.
Piano Exam Pieces 2021 & 2022, ABRSM Grade 5
La chevaleresque (No. 25 from 25 études faciles et progressives, Op. 100)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ee616060dbaf672833aa6a56a8a0f6cafef0605d4ede8db23ce114ba8a59f2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBEYQ2031601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7347f7bb38211e54d8d61b8fb345d531a7d26dbdb44227f1d9daee990b08bc. 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/GBEYQ2031602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8970c091c32c03c74e153a8b47968fd0a639b982020db9ef79a0bc5b23283bf. 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/GBEYQ2031605.
Starry Dome (No. 15 from Piano Meditation)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b0288729612b8cc8abc894ef02697ffc46028d0c8e193e1050c5169d7a1d44. 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/GBEYQ2031612.
Douce rêverie (No. 21 from Album pour enfants, Op. 39)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8602f2c51ff9752e97df25d520b4b2e0f71d986176410b5236f2d8941c3d82df. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBEYQ2031613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e21837d0f6949efaac06522707754f3a706e756d18d3b72961bb2cf85f179c. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/GBEYQ2031622.
Tarantella (No. 4 from Musiques d’enfants, Op. 65)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc405cf2dda2f878523f21e5db54a51731bfb6fb7ff7af87024b3f059bdc974. 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/GBEYQ2031623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072197b38f68041109b0350db7ea47866f557fffcad1c95f33f29d11d611902d. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/GBEYQ2031630.
9 pieces from ABRSM Piano Grade 4 2023 (2024)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdae173c1c10107a099a54970d568f9f97b439f4ac4a784c6a8b34ab71344b96. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZTB72359776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84326855eb3a36287fd235e9d28411fc25d7e4eaf5cba4fd610050727ff71b26. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZTB72359777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154a77e1f881ff1e77e1543cbb234c39dab02485b8aa551e27aa78b57c4d726e. 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/QZTB72359779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37e0964734ceaa67caa5074835954e8065271dccb71d0021054deb851e8e408. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/QZTB72359780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6364951ee9e9dc19ce03527a608587ff127048293106a13bb9681c3a9c115e. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZTB72359783.
ABRSM Grade 4 Piano Exam Pieces 2023 & 2024