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 0x6a2a843e5f3ae32870b819e3bf609700ca228acdf6ea268d2894cc2de7a63234. 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/e67c260b-fa77-4f7b-a8a4-a4c23d5332db.json and https://artists.proofprofile.net/proofs/artist/e67c260b-fa77-4f7b-a8a4-a4c23d5332db.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 0x76a212e35bee58576e69245bd0230af457a46fe21a6fbe84387d71005c7888f7. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FR6V81753083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaec7d7296e1089fe54962daf705f0f16481a40e8f8d13164234117b0e880bb2. 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/FR6V81753088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f0b98ce18e930d19088748ac4d3a6017727649eb2a1767d1e4741e25995f29. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/FR6V81753090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c46576173bf95b8357eba254e916eb2742d37c62b6dfe6665fa51752dc7778. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR6V81753092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8083d87ae353c14c0708cfd3589ea51ddb04008ec3372ea8160d9acec880927b. 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/FR6V81753362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8175f790a66f93f6b3c1f423e292c35fb235449fe1ecc7c51fee9c9dfa7c6cf7. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/FR6V81753364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568242236287ba38d5f9b07a48a33cb6503d2b29692e2da18c91b546252af4a6. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/FR6V81753366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa750cd334ce8032376831c51556a5843bbba23f1d9a3e8f4bc9ac31ad01d85d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FR6V81753367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d75ef1ce308ac2cdd071fd130b6296392e7a04f90f64d027fa546e8b6e8e553. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FR6V81753368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b69b1b7db29dd31073953e05abbab9d7cc5b6295758608a1e00b172909ab28. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR6V81753369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3f402c6bcd2fcdf6416f91cee5308795ee887f90fd4a1af39d218cf9c889ae. 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/FR6V81753371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7f638a7889152d2664c90a69f340a2b113e0b2394fb40e2d4fbf13e58c9e40. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FR6V81753374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5808190528272635b2c277a2d58aa5460784e210ffc29d302e5ba22a7f28ac. 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/FR6V81753375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d5389c435f3571a34e0fb0eb1bdcf080983f2676a6fc96fec96823eed1fabd. 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/FR6V81753376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00971ccc279bb4dfe0cfdbd97cf3d128d434c2f408b3479323830d87e5767c9a. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/FR6V81753377.