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 0x7dfea95006d774c2f1f9d9ff6b6e17442f20c30bff023bcad77e000ab7d4043e. 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/195ac17e-5945-492d-baec-c49885798266.json and https://artists.proofprofile.net/proofs/artist/195ac17e-5945-492d-baec-c49885798266.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 0x2d745b1c94e8ce762b5b94322c1f1d415536d2ac1e99b063981173e9aadfd095. 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/QZES72354518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3461f06f20ed913eea96dc9d0ae8e34b9796cbb79f4eee520c074dcdfc7777. 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/QZHN32306003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efdb48093708f586bd5483b4022781ba2fc8bb911f43cc78f2b42f6a057b465. 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/QZHN82349381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0eab84714612b3fe3e54374c377b940b9cb985bb435e4405cfea9f06c791ed9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZK6M2335544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92beaca886ee3ff4e1b4a5068b216532887911decd18dc266cf35c36a9d5ff1d. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZMEN2351995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86cc601dadbd98662c0ded9228ed4f85e24685a3a8079614cd4e952e1b13c81. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEQ2391272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0b4cc7dbc84d1df739b6c4dc7da67976a62294bda6b257a8db8dd0178f88de. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZNWT2352033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f6b13d5ec672b102a220fa45a0e3b7b23339c68eeff17284336b76616808db. 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/QZPLS2309148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc3226bcaa3cb09fcb70e7fa422f191d8b7b39f9009086f733bfe33bf73db8b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZPLR2382620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ca5916326c56dee5880b4003a20e83b665d7cc3841e165fd2ea1293a27644a. 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/QZVEM2356520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81922253ef2802ae7a65ba8e034d4cd1633a9b9bd0bd797f49908bd5188893d0. 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/QZVEM2356996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb70cbdff678707d122079448fda831fdbc7d36a88dfcec1c86911ffa6cc4e4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZVEM2356999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311d9ada0c4483ba17bdca5c0d9857bea2732abae3b888630eed2a3100f2b302. 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/QZFZ62464785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc816e7e0488712c1f880dc9a73bc1b919c9ad971ce8675d33a95710eb84dc21d. 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/QZHN52400446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1edc6a6602292e560cb07ac4a22df1800e658e0bf412dbd39e4dbea08318f09. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USUM72410694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3946b7c77d0135e74c5298ea81d1fba902ad31cb925f6fed955a0853c19d4f81. 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/USUM72411505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084dd0827cd5c8e2a546f6afd0d282987ef9c2e3e45070453acbec27284e8228. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:16:46Z), 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/USUM72413320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29396ec6d0b57f4023040ea5f8a31f8b7226ed15f78741bcc957b34d0a24f09. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USUM72414140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b62ffa3afab87de001128424a2b123fd3f0ebd7838e93f4e3039e3cdfff284. Chain 2 (Bitcoin): anchored in block 957540 (2026-07-11T08:19:50Z), 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/USUM72414550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a96c1dd712ffdcb423568350f0afd3a58036c2a24fc465fede25c833a451b26. 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/BK4DA2503734.