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 0x26f282427219adc4a38b6ffc500817faba6af38efd86c0b963e128302fb0efb3. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f58774f7-d49c-44a7-bd29-6fb18d535bb9.json and https://artists.proofprofile.net/proofs/artist/f58774f7-d49c-44a7-bd29-6fb18d535bb9.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 0x3e2e1610d69e8feaee1759bc37090bf344871e342a256f34d2c07e3ab4bffc99. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GXF9Q2457645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055da126a28e985b59adf32185096b6b5aad5543b913f964899298107b26bf28. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GXF9Q2539146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeefe459df09ed421c5859430b1649938c92d77a37dcae00349b9fc3731314b20. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GXF9Q2539148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb63d387462e00bedcc17f88269968521a7d7a28b435150e6e19bbfc8acab052. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/GXF9Q2539149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44105c49cf7066c8880f222df8242dc96707922abcf4fe067e9f601d7985595a. 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/GXF9Q2539150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8f63d3a6fea849015e42c2368dc8a680bd859c36c0e8e8838b5e3378b46e73. 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/GXF9Q2539151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e9afcd3dfbdfbfd335b179468451a04c0ce54b32687e6214bda76de8b4edac. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/GXF9Q2539152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05b8ed47da090f4b09ac353ad69bea64b14415d98bfbf388dad327ceac1228a. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/GXF9Q2558164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a38527db3c615a304e9f3352fce4c93e8ce8722889f8de5bbefce9b2f2b7db. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/GXF9Q2593368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e094b61b1f4690ac21a55f29b6b4551a7427739afa709f8a8cc5fe01b59c164. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/UKXN22506796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdfa640913ecc7beb80a6e6935e00e5995b4160c794127da6d9dcd1cf73d520. 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/UKXN22506797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477538eb509248455ecc6e3d9548ba9dd552380835f54d91fae881a15ed48674. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/UKXN22506798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd354e16f31795e65084255571662a89ba6e525843fc5e60bd2f1d2ec5d1c9ab. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/UKXN22556426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5885aab4d42b7a0cb2e0134ed0fa0ccb99ce40afd3f59d36ec7c90119b6d27. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/GX3Q92556102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d4ae70ed856a58ea7ed77950fa4bcad2478260e4c7c58b77d614c1eeaae81b. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBMA22595008.