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 0x44f1867fd294beed8045907b1933c0896b60c6c11811493c43a3b970d6279cbd. 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/6a211b49-a25e-4212-beb0-54fbbcd6703c.json and https://artists.proofprofile.net/proofs/artist/6a211b49-a25e-4212-beb0-54fbbcd6703c.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 0x67654347883fbe0e0ae1206bf960912cd8234de75ef344272ea68be29c77626e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DKUM71900733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f5dfd6bc3c2680084196025616b4229330e17c4886c5333ad1e4e6d992a3f2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DKUM71900643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa304becabbbd420402a11fb189f31ff0e7712c97129309b5d24c228b4fad3c05. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DKUM71900734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec6f06058ee6e1612cee03921c6150258792231867779ee9dd665ffe506c034. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DKUM71900706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc587cd7801c11e0bee2c1547aec82c932cad8d4ab7a788666865a4623bb28d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DKUM71900735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd9e10cd99c7972eff34b8007a41c4321a2e55e789669ddad945103e66111f7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DKUM71900736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4ea58fcc7fec288f5dbd49e4a2b1cad4d19dc0b74dda4bbf335850baf53e0b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DKUM71900737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5618f416ac8cafc959c3822391a2318d82d7aec73b7d336711075104ce9ce0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DKUM71900489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4e3508399b3d1ef1f241664068caf16a29dcd6ea8b4ad15fe409a25b8ac497. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA62409822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b536f8ed43f009622f90af4d36fc7e9848582aa3972ed30e38af5b96586428. 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/QMBZ92403131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338fdc3114a5b1dc7897417387bf97cbd856142d5903d64c2bd85a6426778bac. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM7282446085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1167cc5fd7f62e39645e3acbf4e3618f65261675a12ce1f548ca8b2030dad2. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QM6P42484023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d99e3622bd81d7d01a21333192ce11b4a94d4b9aba045240e4e4bcb0120d02. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKUM71900066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a93bf8e8539ec85d2ec7a8d246bd835d7682819a5e21ed8b623acfe851ed2b9. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DKUM71900214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6230117b6292cae219120221845b57027b4d9df9b550075ee9eb160f21f71c. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DKUM71800759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65f7fc5c727b83ff6f540f6dade88152f5e4d23d0f7df58e8ea19154e6f65ef. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKUM71800735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921fbe505a1ec1321649dc06c6bfdc74275b4427a3172482f3f0115dcbd3ee61. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKUM71800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc320587ad948cb30ae2d3750f86148f04677b1b2ef37772f487d79c5b113fa10. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACY1716010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578aae7ed79d95517c59bdb72873ac03eb167b48b2d77c54ae1e7b707ea2edb3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCABZ1431261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9191f18a285497df8924bb3f8e5b3211eaba2255252934f949665d58a4c863. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN31954499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb7b8aafbbac01788795f54b10462e9c0d2e94d2e20e6f885c1d3d5f2220fbc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CH3131600116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2db535aef634cef5d3ebfad3eafaf6f99f51a22bb3fcc7fd46da8d1ded2f6f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM6N22520733.