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 0x3af8816b0ac533a01eced209aa6874ac5dc3acd449fc9ddc13d056062e9baaa9. 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/26e9989a-f07a-40fd-aea8-8df9e98be9c5.json and https://artists.proofprofile.net/proofs/artist/26e9989a-f07a-40fd-aea8-8df9e98be9c5.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 0x79f7cc932cd18256a1e0cffbf22081b06c9fced1c3d2faf8b554ea94dc764b60. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES61970611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d68017d43ce66ea3ad16e5462f4d85788d735262809bcf40c6e8a51cef6c23. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN32179742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f073bb0daa0af5609787140b2806417c0e16b964be9ddfda35a5607bb5ca0c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6K2130103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6790a78cf07dde59dc8f7c84030a01172fb76fef808df221e69492779bc5667. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6K2131318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0be43465e8cc19aa96501fa9df5018ab5e96fba97214e3091ca093ffb79f382. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6K2131320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc28c23f4d6a21d52de9c21c137e9ce115ca37454b1aa1df8bd55752f23e5ae0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6K2132683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5c57edaa383b22f14d6c5c8b6a3760ca9009c3b2bffd5a3eaf0237af440ea6. 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/QZK6K2132686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1d148afdf7b8a8cf976de740332a12d9b68bc594d33a5674047a3a9b8e373f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNWX2159567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6a4770607fa36890593e5dea0ecc54b88eddec3996634d38951a73b11bb4e1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2171055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7162f616ceb6d0b0270eeef918122310e9f3eded2cd96a836d08543dc3d89669. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZDA42234670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb788748939609b2ebd205c2ff48769cfd7bea3128e82209baaf32e0d361b9cf9. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZHN52220642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760b01eeae8f85c4eb380da4a0a8c8d9a3c477f8f20300cfbe7fe29987fd144c. 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/QZDA42234965.
Come Thou Fount/Amazing Grace Piano Medley
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a069909d8c95f831f7098c34eea4c0f180b3a757ba5a632d335f8e29fd783fd. 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/QZK6F2288803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb75a9eb813412a7a64053b801ed443cdeff6b22ff1ef7d458dedf898c4b298e. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZNWS2239731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0aaf50b96c923e5ec21ffc9b8ed207cddcbec7a4a5f7307ca1bd36c7ff101a9. 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/QZDA72342302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ad51ff187f25eedd705a33ed7cc19de2d9c29fff928bd5f5e30fd8a2fc0e26. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAT2377448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd1118ace0ef18b6bc1aa7dfe0fef4173fb6efda3ea01eafba49cdee0b000f7. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZDA82425902.
A Poor Wayfaring Man of Grief-All Verses