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 0x70a2d33d462a27d8de692013435bda3253eca57b570d94421f5e54150b24556e. 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/34054583-14b0-41fb-800c-ecf129b3e5f5.json and https://artists.proofprofile.net/proofs/artist/34054583-14b0-41fb-800c-ecf129b3e5f5.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 0xf73c2395bcbcb7fc95264644af86908c66762819cc6e5b1d06738bd4f823b378. 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/USUYG1393174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a8bf25986664f8fbf643551b5a09d6439de79f267df9aa972d268f902caf09. 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/USUYG1335679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ab5a7bda87967b53a9eb1ef09908d8f19742ffbd246e6a16746ddfa5af3480. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USUYG1313853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5279566e8b3ec6ae94192eb85e86e23d4956258c2a5ed0eb06bba11ca91f1184. 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/USUYG1325307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7074b3cb370fe53d26c5d6cbb9ce073b8a51e4e4dc499d21892f4f776c35690. 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/TCAEH1986588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e299469a48b8f292c0247f9796926592f4f031c4b2ef0fd659eaf46b28495da. 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/USUYG1353834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc335c440772fe176924f95f8b46116d5bd4797eb095cf9811de9e9b5433f02a2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZEQU2401479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7b0f22dfbfe31ad7af3b305d7c3d2fed13a705b1b58d2a3aebcb178ebc8a32. 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/QZEQU2301663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4abb40d0fc934719d45a2d2cb773e7176f96247e9c8144c7b3f16fd032a5e4. 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/QZEQU2301436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44c93d273de3c28fea015430cd803bcff7a05926d02dfaf8ac39c733b73c1a4. 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/USUYG1472086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475c83169e582da02f90f3a2cfd23fa51fe844a06bb205784d6479beb2e8635c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USUYG1413755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e299469a48b8f292c0247f9796926592f4f031c4b2ef0fd659eaf46b28495da. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USUYG1353834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5279566e8b3ec6ae94192eb85e86e23d4956258c2a5ed0eb06bba11ca91f1184. 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/USUYG1325307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0891f1399607a8504875aa05fded5a487ad190aec1eccb9c9525f5ee683869. 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/USUYG1318719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ab5a7bda87967b53a9eb1ef09908d8f19742ffbd246e6a16746ddfa5af3480. 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/USUYG1313853.