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 0x266c62db0920c848080b1c01469def141ddc68eec142316f81665d390dcec086. 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/cc77f1f1-9371-4243-bbf9-1bb1922f85b9.json and https://artists.proofprofile.net/proofs/artist/cc77f1f1-9371-4243-bbf9-1bb1922f85b9.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 0x5dd4574fab87dfcf327652929b22c50b2ab038a30816b88aa600258d1370c7f6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USHM91866802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8267ad568f09fb2eba9e554d458abc48ae9694b14e7f7fe3df78de155dd7635d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:31:19Z), 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/USASN2210076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d155f83e5712cd1865a28e94ea514d51f6ffc5128150b01b046957e31ccac84. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLZJ2465179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34980e4a41cde687fd7efeacfdbbc264044c3acdcc7e81fcdaf9d0087ba1dcea. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBRKQ2429189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29006ab4bbcd2864ea7f97f60fe7c7fa9b934dac80a26166cfb7299a4806da06. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBRKQ2429207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ab6504f57a324e79737ce4d48c81614863578799b4e558521040d08e8b3710. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBRKQ2429216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6dc37b17195539f65e339e0bb5455957a985055b3db8694b37b1fbe685279bb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBRKQ2428404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836c63fa7bc9cc3c52e29499f32d965f3b01f55f203916004531b74a01b9b1b2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2459644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6fc04ddd50e85b3fd94a397c9cecf9e2bb1549f28e4a38f7bbdbef0e6d2148. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2459648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687bc8125065d82ef228ebd05e282c20d2c45381d17e4154ab806abc90652b43. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBRKQ2429159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf057adf0b49cbdff72d1986fd3b0a072bc5de3b128a210faa38d0f5d48b506db. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2460162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ccb36703940a1d807fadf086a0d9d6c5c9852d895695f6dbfe732c87d60c10c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2460178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38fe066a5cf5f15dd8b91371a5b330b57c03059156b933716cde9d67e341ff9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBRKQ2460188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbb57d39e613faf65661812e505b6a9f78e206a78f02de64505bfbab629a8bc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBRKQ2460214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6de0a66cfc860489d45a798f582bf133478addea6745c4874f3a72e4792fa6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2460229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd271c8cdf8650f336f19894890bd2ab6206e7c2d36dbab31a079f18397325b1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBRKQ2460233.