right|thumb|270px|Yame City Hall right|thumb|270px|Iwatoyama Kofun is a city located in Fukuoka Prefecture, Japan. , the city had an estimated population of 37,782 in 16050 households, and a populati
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 0x74f0fd4867000761f3f6ec88e3b4ba780c27a9240c49185802e9b248388294ea. 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/5ddf26c5-c9e2-44dd-b725-2ed366efa1d7.json and https://artists.proofprofile.net/proofs/artist/5ddf26c5-c9e2-44dd-b725-2ed366efa1d7.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 0xb4274dcedf3854f9318459995ef40eab41c5cf82b1e8ac065701dbdcf9ea10bf. 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/DEG932002238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0453e5fca9fd8eaae0a38eb18440064442eb335fd84910f367cdd5ec5ec09181. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/GBKQU2203154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce33d47f96b3cd9c96623af9bceaab4c45dfdb27510606aade90cf8ee7517d9. 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/GBKQU2261313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2566ea582d4cbfd7838f2f0c70c657bc05f2d0babe33117f3852dd5bd2ce8a. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/GBKQU2278602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9084718369d8d2a082c0099afc5afbc37d52aa37272c35bb3de1b4d6ad8b0ea8. 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/GBKQU2278603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7372efd271b2af4d7d506bd6437d7adafd79a179e62949c292c36af1bee5abb1. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/GBKQU2297316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bc9cb4826126ce640a1dbd39637e6899a335765e48e15d5b09f63fdbe9ad12. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/AUDCB1702230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc096444ce2a9e1312a02a840865450675f93db7967ca139e1cfa59e78e15f7d. 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/AUDCB1702233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bedc0a89c3b219ffd0f4ccdc0137fbd56c323f3111bc73d917f6a3b527fa17. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/AUDCB1702231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc478a8c4b9c7fd8a585a9fd1afc1f2cbe5cf2d1b8c657c3d4c4c1040d964ff16. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/UKR6V2380881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b984505ffe76657af851774e863b3a864b400f2fcc1d0c9a3c776f89450f694. 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/UKR6V2382165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9561cf80a0b0c2c4c710ee00d545d68acf0462b5d0068ddccd97c135cc62d47a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/UKR6V2485241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde15d2b85d91b727bdfb340539adfbbc33dd83133851bec5323c99a063ec24bd. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/US83Z2520896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436839b9c8c96b16a6bf8585907665bcf5728a73d54d20775c264d2f1d777457. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/US83Z2520897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f419eff4d7c7471bb4a3357d944516a70cdc7c5f8386b302be8483a01610999. 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/US83Z2478499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7154a141e94eaf4bab968abec8eb0a09e45d010b1edcb8abb44e8e1c17210529. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/AUVC02488031.