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 0x8a51ddba0b6af4bcda813f79433c7a69bf120d0c9babd0b641964216e46128a0. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da5f5bf5-5f79-4b6f-a6d4-e041ae1c387a.json and https://artists.proofprofile.net/proofs/artist/da5f5bf5-5f79-4b6f-a6d4-e041ae1c387a.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 0x62c2abb7d8ee139b142b6fb93baf1c7dd476116857da1f00d55a4e735c6586e1. 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/GBKQU2461264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d22598770f7f28b77ad4b18eb40ef6ccf3c62905a9f1489f8c646c7dde72d8. 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/ITA061302069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f10c4ca5d7f90af1d2723f8730a1d2d62f828e09d3632f27d0f7a352a00a99. 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/ITA061302070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a80126fe5c1348967d6a3f724c360b19c6c5b5e5da720a4b4bcd5937573022. 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/ITA061302074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221e37301171c0c7ec734416140c8ef3b2711c811a4298279f1468840ded9dbc. 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/GBKQU2509248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614da60c2938359de9b4162d55f96404dd129614681bc3d00859e5a06cfe686a. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CA5KR0037177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a128a5740fbd4dafb1e33fde6ed1d120b9a47ba0509773cb29a45a20912626a. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CA5KR0037178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9199ef8f18e7849966975a2cad44088c07c9a820a5e64038ffe45c5cf24aa5e0. 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/CA5KR0037182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c04e736551bef0f67afea9352717ed1d19941fff8526cfbd302187a670261b. 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/DECY52100665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d719807e908531983162194c8ccfda281bf0eb722979f329ee835d56a59dc4. 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/UKFDK0030426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2357c819357e95d7855113937e08ed4cb679a895bda6fcc3dcc8a22497839f5. 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/UKFDK0030370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a90375a8de084af585adba03ea8bf3817a4af293fe9be0a43de42af8d72d47. 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/GBKQU2291454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28489070deca4dd8559ee27f6311037a9e103541bef2b8d7f9ea78ddd9cd0a3. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/GBKQU2102870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15e32cab37840dceaee2eadd4bbfa2c7e954df7176609d13e1aa063eef98c86. 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/CA5KR2262477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f3229cf174a0889f0ed9249761fa8fb3df063959eecf863505214190ef68c3. 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/DEDL80900846.
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