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 0xd0b037d6f67ec9efc069a393efadd6a641edea67b959012ef4d2e22d0ad848f0. 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/868b2db7-c193-4ed7-8c2c-7df0cd4daa96.json and https://artists.proofprofile.net/proofs/artist/868b2db7-c193-4ed7-8c2c-7df0cd4daa96.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 0x93b84bfd6e2ddec8c4d82b5dec371ace2ce92d5d0b3a79e5ff8d06926db91bfb. 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/HUUM72100654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61cd332a4b0947578995cf016ff6d1d85b1ec14c6684c6632c424769e0cfd08. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/HUUM72100655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec25527d18f8b5fc0e6bf0b539866f504ac916d993ebcbb17645b1c6f232cda. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HUUM72100656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd32d469ae56b432ad3fdaa5233ba559b8f5c3099bc054024770831acb113279. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HUUM72100657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a23385af8d1ac1de34cdac51bd152d245a11ce142375fbc033661f5511302e. 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/HUUM72100658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19d010c928d9e8d475f49902a3d45a1f8056e2ab78af31e2e2f0ced8d194e22. 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/HUUM72100659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8936246101d260339bc196673cbe9dc654c5006f2f5e626ebdc8a7ee1409c6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HUUM72100660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723b6147603d8517d0140c9628521c1062fd3e4bc6f9e404c82ae2d7310b52a7. 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/HUUM72100661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422d87e2794bc69afbaa46d3af7a8a0b213cf836e6205ce75aa04977cbfc1e6a. 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/HUUM72100662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76eb6b58972589734659c7fd11632d6eaa897eb8d146803ad0f843deab5d3b7f. 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/HUUM72100663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f28bd5d5cc22134478112908d5ab458f9e15d62aad54619b5329e75329f26d. 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/HUA612302911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd324601e3faead795715362c4bff595607c6f20f2b9fcdccb4bf1d6fdc4e98db. 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/HUA612302912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954b8eabfc93b6bb8022539ceb62089d24d3e810f569d352896e5d57867985b2. 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/HUA612302917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51f2138e10286f69c39ae4e21af0c1e8905a1b4e9f214a9afd11f2c696c7479. 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/HUA612405411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f797fa628308543435b87dad8c9a366f88f537de02a8f79f40d8e28307f5d8c. 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/HUUM72200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba69f80055c5253bc2f0f15c0b960b0a970429513b553627f5cec7c8dbefb458. 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/HUUM72100414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323e505094d8e9ebb27d1a66e60d4935e44b316c6ad6c8c9f392bbd381078faa. 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/HUUM72100407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1d364eb10971d9fcc8232687aeae1c22dd74e74a043a6bee580840f740f5b1. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZTB52387290.