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 0x37b0b97a1b47290f1a7dd81a7fb739a2c397883ae0fc4e76f4a745396849fb9d. 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/f683f663-e122-45e4-990b-936a5656615e.json and https://artists.proofprofile.net/proofs/artist/f683f663-e122-45e4-990b-936a5656615e.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 0x5a01c1704309c58c08c661dec2d7c339ab3f497c56ee2a30836ed85983922b24. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/FR0Z50071440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2c9fbc821637fb065cf57da8bfcc7bfd6e14aca21382a18dbebaf5e12dc43a. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/FR0Z50071438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6baa23c2201f410f45a3d6f37797a3612483f7e7c0934ce381862d9131a43a. 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/FR0Z50071435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69b474690dc954d98ee290f70dcb2fb7bd1f8b4f94f15c1af7e553e9c2b2744. 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/FR0Z50071437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27aa4c1184cd7b18fef3aabb6b3b50d7cbce2baa23e28f08ae512fe879720d21. 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/FR0Z50071441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b833bd99086eec48379d87003cfcf152b7335704e19886825736833589a34aa. 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/FR0Z50071446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33cad26c5bad2385c50f4272ed772a48b831a456de1945753311fbd007e04ab. 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/FR0Z50071443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ad11783d2df90807fb2dd67a85d4a3a9533fda2d9d542a307a8c39aadc1148. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/FR0Z50071447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba9998087653176ea0af48835ae6d71686251b5d55ece8c170cfeba2c4d99a3. 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/FR0Z50071445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27f78577f8dd5b237bbbe34a4efb4e93f5411481ec6971dc79bcc01dcb92687. 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/QZTAZ2251307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12f96c62dbec7231f416612dc70df3646573472b298bd0b46e6d2d61d567335. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTAZ2251305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28202d365c0a80ca32be9c40614da5015f74fe9a43654a650cfa431ad6cf98f. 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/QZFYY2380427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ddba624d9990452d1e7592bd25d2eeab232101447b997fa6f6f6e61243cb53f. 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/QZFYY2380429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d9580a282bf2d8f66f4bc0625461ecd06dd8937361d38c88ffe0dbdc8f9c32. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZFYY2380435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf9d75148d942b01e1ed688291772a41e6acae7857dd3c2a78b24b38bbf3580. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZFZ22372419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f19d838dbb8d3ec486fe0bbb1048262b5a22b31889ed6debfd2438c3d4e114. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/FRX762307083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7e8dfcb84d90ceb522c6c47b9504e849548fba302713e97cb36ba589e881bc. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USJ3V2344950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca93ad1867f0b6ad46e4555bc48c8fffe6fb07bd7357d2be699372b3ca1fdca3. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/USJ3V2344952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780dc4b5114426b21322ec08060ac35da77e72e7ef2399bf94ec106dfb2ba6e1. 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/USJ3V2344954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249dd5f57da1f55134f56efb097f4bc77fad3c2e94a2161be83f744878c777e2. 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/GBWUL2596965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57f234e12cdb73d643123f523ad6da75edb158b6768299165d63df6d50f4bcc. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/FRPZ92400430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe835d209de3e7ad16ee3d93e8e61a092dd22aba6e913aa3fc3d164dc79522c14. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/FRPZ92400440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1009b66341ce5c5891bddaf925d516c3c01e69f148f168025213d7408d185f9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FRPZ92424990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61de4ece28c4db11b5cc53818d5734a8e9fe5083fc8b389a057de8d1024273d3. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/TCAIM2430821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed6e781722d013e0a159b1649f87b705530c814fc7d20e6c70667f42683e581. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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/TCAIZ2451399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7366d1bc723fec25d3e0fe3f9e8d10ab69de64973a8474d5f7989a4bfdd9065. 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/TCAJG2546083.