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 0x8d26c91d4e09bbf457885b13201f52bf88779fd1c8603c6972a4872ff495a9aa. 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/d7f4d066-59f2-4230-b55c-a8df600094c5.json and https://artists.proofprofile.net/proofs/artist/d7f4d066-59f2-4230-b55c-a8df600094c5.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 0x301cb744c7ef8d23df5663051263a35358785413221be4fca799135c753aa4d3. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZTB32274528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18c7b56014ee9fc4eb05d0816599b6b494745bbdfc3eb264789a095fbeaac5c. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZK6Q2393779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd87bf84482a70cd1409779609c24db22f4e4b01ed9d886eef6056892601376. 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/QZK6Q2393780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a09984407d25d6e2b17b3992f839a583b3cb743c84da99da4f0a14c7f62b40b. 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/QZK6Q2393781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddbabfe062e816884fca606622f24b27170c955b881c8bfcd090c4c60febe292. 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/QZTBE2361986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c8683459d2397a97c512e114cb8e4c066cb86036f11c14a90250e6dd9ee16e. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZTBE2361987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366386c82a42d3a65d1aaacc8f64e08d96c4edb944f026028763e7a40ea4bb4c. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZTBE2361988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec221908ddf821b713b61a0735a66aafaa95de93270f6deffb14677039b14e1. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZTBE2361989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa56866d11619f6f906e42e4f1494f8fd3498649338e36cea70dfb9c74435f9a. 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/QZTBE2361991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f3de5267129bc97af93e53c0c2502fb7daf8becfab69b2cf4edebb3b5525e3. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZTBE2361992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d712159f1566116ea6fdb7566486c03a68ad857d5185ea8d37e2804b8d4a3c7. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZTBE2361993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014833c092dae0e124c3cb32a055e491cef43d8ffe846cdd86d1e4df26ecf709. 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/QZTBE2361994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a709e7d8e794360ddcccf46c26a775e0375d4deea6b271dc35446f83f92dc06. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZK6M2409925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5899b67436113a70e11fc19a4de48dc810cf9fbc8f115918fa7d80329c11cbc1. 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/QZTB22533236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9766700e6bc03fd80401178ca96ea1cb3fb4f42446f6fa0e64b9cc518ed485d5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTB22533237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ed471f1b2466717750b93855f94e2fcbb8ff4d31cf97661c51c0ea6cb5d877. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZTB22533245.