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 0xef6ef7581acd1ce9e5613c32ab0a13c5a3c32a9e408e1041e10b7d524a9f6bb0. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a583b9a0-0771-4b27-b67c-5a9e7b78f526.json and https://artists.proofprofile.net/proofs/artist/a583b9a0-0771-4b27-b67c-5a9e7b78f526.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 0x4ff611b928608f1239f63043c51273145ea70fe26947476c70665f10e82b7876. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/USA560991108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9d5274bd7ae17bf5fd2e19d27df3c6ff7015b214c953f9360f958f278af26a. 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/USDBB0603552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e97d87710dfe15c4dc4bf30945f65954c19eb1298902f1234cbad6449b9728. 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/USDBB0600657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc329b3db57700ce01fbca338034fe468834b934b8869c3549fc618b127c40f. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USDBB0602227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81c81def3ac85785694c0efc003198ccacf91ee62c480003d4a87bb47d52a6a. 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/USDBB0600189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956dabedf91e5cad7b0c5d3df7a5a4f2c760017f41ceb051ea76a2570ee808ea. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USDBB0601606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87911586b5fadf2b563b63aa57fce30c5544a44c8c8696ee9dd55b8bfd6d8898. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USDBB0600680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f959f4031f6e84a3dd302353b356f8482627ef14b5238fc41c4b74868e64a6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USDBB0608881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8464f0f4bc1789bdab26d7dc2839e6f2ae7063310915aab5a114f9ac5ad09a06. 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/USDBB0609224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5818a2bce56cb7027fbd813700bba5a1d3e736bc91a4cc0c1cc64b8282c8430. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USDBB0610515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5d9c70b4ba0f1925083469b71244e6f7948cfcc4c61ac387d2389e91c770b3. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USDBB0608290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf909b6a3ce161d1ee979b65c27fd70d162ba878ec1a6ac395849086183773d96. 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/USDBB0610516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99cab58e3e1cad0fa23300d64cc103511c9114b4d5043f01bbc90b00cf1d625. 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/GBURZ1002481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c12405808d72bfcf74c623ebeec7d6f6dadc148b5c1293ed69e862301c29c7c. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/GBURZ1002452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6102d70f4dfc41e6f9cac8ed37523159b3aeb0bf740ac20c1daed8a5ce221ba. 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/GBURZ1002455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeadf12ea95dc563c3639ae5d20eb64c207a5e76cda4eed2bd8aca1ac7ff9c94a. 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/QMDA71386441.
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