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 0xe74dd3167a55d5be183b3a52af272e45401e2d8c833b97cc38cef7ae12f22ae8. 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/9158227e-e83d-409c-972f-3cb4f289630d.json and https://artists.proofprofile.net/proofs/artist/9158227e-e83d-409c-972f-3cb4f289630d.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 0x0889db44218a2ab6d27f6ba6594c1e208e13a29b22885fa5493debf14bd23b49. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLZ661800062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540cdb9a00b4a340e5ac620e25a2aafcebf3b6b3eb6062e49639d6572a7decda. 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/PLZ661800066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eef7d67e6d97fa2158db2d18102acd496761deff6185af4b0f355667ae878cb. 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/PLZ661800083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574d1e3165d54b50878aa379dc3ddfd4bd81c55d35a02b92dd8771635bab29d2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/PLZ661800085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b26adba4fc47f70cf75f9a2935ffa8ba5d45f055e8ce4ccddbd8b4d8f582c5d. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/PLC062370829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aadc49d84912fab2e1ac005da2f7f7f26f156679dbc2feaba30cdd300342407. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/PLC062371061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c8342d27d74ac153ba1db5c9ce27d7f9c7b04f9f57036936067bb186802a17. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/PLC062375691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d04cc301a0aa00598344384b3b2c7e7716cdb65ea3bb5a706d138dbace4e98. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLC062378977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29120e38b5813c949084bd2a8a295cbc084a79b473a06ed6e550da3e5a076c7d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLC062406336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9aef89eee3f9dc50469666bbe4dc3f226d4dc6bbfe870954e61012e25af9ded. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/PLC062413629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0558c65b028afb081b3f2016c826cd473c9e22bcf743ed8521dcca72e45d9c00. 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/PLC062425189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879fe1ef57ebc96442677d1b5de4db8b64a49c2bfe0ff8962dfba25abf24b917. 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/PLC062515248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7698d1033980055fe3d716287726ae7d9a2802c923b8e8259d0358bc2c9e2ffa. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/PLC062528287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee75c81353127c6108cbd3163bebee4147a30b115884ef6a9061ac10ab6b04c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PL44A1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf125fba0269c3f7924c13622d9989ffeea0744c32de6bd4fc3ecef24368948. 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/PLS282200209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76aecb474906e16e49492aaf8f2a7f8f06466707ba4520159415651e6a63891c. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/PLF242210287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4715888e82a42f9294ad64e85bc418989844298cc938d63d10023e77c24d2f. 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/PLF242210217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6c92f356d7bcc2b92e8bc904bfcfa27994eab468061504f27117ffb1c02027. 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/PLF242210204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefdffa71c4377a403550ffd17f0ee6eac8bc04cb84e8c0917e3dfc18ade9229. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/PLF242210206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62a4f9b5bfcfdd6dd48408bffe879bbb7808b703987ba097315e4036294e60d. 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/PLF242210209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9f26e7d7a6bbadd07caf8e7ca25b0d4ded92438f7eb24fa4141efed1f56bb2. 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/PLF242209764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7245b7373aca6d81bdb95ca11d1fa1f201c4861d22576e69778482fe72167f01. 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/PLF242211140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c89a1d24376e5f921a65de3f0c1e53ea4e054a836fa1ce6657e4f913580e14f. 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/PLF242210146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9ad18f7f1c39eba3c4a7a736ee0c3f1072617c6f67f6d0ed1d364e2f1ba3d9. 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/PL44J2007440.