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 0x4197c7b266c835955f567964084931bdf9d4a33e913eb67b91269c8dba457538. 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/c71b042e-ef65-4e35-a14c-3e618bbb8c1a.json and https://artists.proofprofile.net/proofs/artist/c71b042e-ef65-4e35-a14c-3e618bbb8c1a.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 0x1b92b276cab1927eac07f50b53d6e6bbe240837027a490d5fc8be36cb6980455. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/USHM91979247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c09a1f3862f845a65258f16b19814ebf33ba3384b7ba1f8f3e98e5b31e7b67. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/UKXN21911435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1ffad14c63d08e206fad23fe7a7197e81194f1f2a8f14ae10b76aa4ef93abc. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USHM82164312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527fc3fff022347e7671baf0a0c9edb2dfc432d673140981768074b0744c71e5. 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/QZNWY2147568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3dcb1552dded94c05890c09554b70ac945ad8e40831c61d4325501dd516c241. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USL4Q2156925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef99518b2a6641f5d684b26d247a84ebd0d330b4bcc9a3eb5436343c92fcb970. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/PT7EX2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e943b3554fdbf190944377910f628b4c4f833ea4f1020b99972dd1835b93be4. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/PT2DY2300431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1474a81e4faea6d9869aeb7741867b84a3511af8084e147de33bf7c8ecaf21b7. 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/PT7WX2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f724b1d434a6717c9ee3e2b9e57317ee64cdd6b10989df55e7ce754e83a29e7. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/PT7WX2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35625ed614f7fcd2060391bd00c35683f2c7ba918ba0e81cde575328b662e7a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/PT7WX2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8127238c8b0040e5e971e80c5b5c8a73ed053673f7628fae7f952183b955d9. 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/PT7WX2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95cb43f361acc915cfa122d7578dc1e0be4e6810c5447b487c89bec3f6be89f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/PT7WX2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5776b8c1ea2568b6381cd919492ab35acc33e0bedb841f0eeec598da208d7a. 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/PT7WX2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed52b8aa271b3430c3ec9eb5cc83c2c583f0ea413d817e67fbdb73557603060. 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/PT7WX2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe444c8abcbd1f7bb473fb8a2e3cf2d31fac5b90771a6f48d391c5ab5ca149517. 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/PT7WX2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5efdd7de56a1f0387ee2755da4eaf2b9d4b635b277e280b87c4bf50ed8d4b1. 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/US7VG2044816.