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 0xfc5cf352f4e5a0046cdc3c737b7d0ce72a2dabc48236eb2e9e86dccbb5122e9c. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d3ebb6f-3c0f-478f-afef-1b5c2bb8a3e7.json and https://artists.proofprofile.net/proofs/artist/8d3ebb6f-3c0f-478f-afef-1b5c2bb8a3e7.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 0x811edbd2bdd4d9a7ab7e3b57681fce2cdcefc78493e1594b8adaefa78f74bc83. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/TCAJS2522461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874069978f8d01cfe00eeafc1ba4de9559c46faae4b0074b7d4349689be3f320. 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/QT65Y2544898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1284d9a89bbfd8f4a8c6c97df2de06ed2fb824ba7d44954542c9c56410972371. 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/QT65Y2544922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcbf286486cdb7a4755a4d74313f8237444f6ed10fe85525660ca83022adacc. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT65Y2544932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5eb1c742f534f567f7ce6877d406e88ffa824d91b250890f7caa68a559a40ad. 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/QT65Y2544937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa57d2173fdf3d6bce7893c25b8ad2148f74ab13d500b2afc6978e6d3dc00b5e. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT65Y2544943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dccdee732107ae54440ec9251eaa33c155c392ab1ac9577bdaba1f22c52fba9. 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/QT65Y2544953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda10b9bf0e3124be8e5468db625ea06cc488f6936d11ef7c85cabd542dfdee8. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT65Y2544965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9291286f42563dce1735c3576812704f44d9b2e252613cc5a10478b7c41f9439. 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/QT65Y2544976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469f4f93beacdfd9ff0f1fb3eb2071d19b5c270f279bf460314e67d5e2e04ffd. 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/QT65Y2544989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1eb4236959726f9f909949d9d8549f7c907afbbc5a05294f806b58567122e8. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT6622551396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981840040573b75db8defccd750d578e633aca24f86e4599bb9480141700c96a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT6632542821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63ed211af9d5d6ceeff64f598b48023960db8c10890f941d1b516cf5118c305. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT6632542822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199e20bd962d907436be2fbae5130bb57b8b8f7d2518cbc413a3bbdba417a362. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT6632542823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ee3ceae99542ca08f8af80cea91a7da1d75c8d47f713c7a8c6d07e6822fce4. 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/QT6632542824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375807807a449ebcbb3a490ed54df26989f575384b9fcd0cd2c5664bc45b8f37. 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/QT6632542825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de6dadad46ff25361a10ec48e2b0cf02c04fb513085ad7a61e7bfa6fd13242f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT6632542826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cfd11d40dab6de9f5d691e2265fd46dfea383639b38a4dc77afd19ae88d803. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT6632542827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5f29d489bd37d7453060f5724ea8ccc2e21ed3cd3265ab479dc76a24e88a45. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT6632542828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0016d3b5d988df9ff8e38793fdbea1a8b6b973a8916ff0848ab32ac307d7e9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT6632542829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd483c75c3c2dd0d5114f4bfc395c14600cc2bd5e793f092a0814893ab15f3c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT6632542830.