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 0x4cac4a120afdcff3ce69630f5c16ff7936463cde189d768c95922f7c333feb31. 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/8612aa4d-e02f-41bc-8bc4-f0a50f7a6af1.json and https://artists.proofprofile.net/proofs/artist/8612aa4d-e02f-41bc-8bc4-f0a50f7a6af1.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 0x2ed5b9bcb09ae5d5407501100e1949d44804a6f494931a31638f626bd6871310. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/USHM21637120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e0160430e529e46308513087cf018cd4f470940408b75b8eb785c35d53e6a7. 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/USHM21637124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef389e20777ed90247b862b9340efc6f106509742478ef7e5d100148336423b1. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USHM22045949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae035f672968e6b1cccbbc50eab808533f14a4f65a9db2787f712234481ee25d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USLZJ2338236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176622beeb30813c227a971f63c984c260ae9f86c93ff8136924467692a5b3d2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USLZJ2338671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b4ed3c698c01fc84c7f563fd1bb9d6e804f7c922c7316a9f89cb4744144798. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USLZJ2338673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d35b7aee4c29b6205c6cdaedc82098e05446ebe17684549fca158f7129080aa. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/USLZJ2338683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b2d654ac4c63f56627f04cbb25606d8b9889f000d476ecf48453cc26d5ab7e. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USLZJ2338685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcad05a1d6fb7e05b85ff1beae02e9fb2a8eae4f8e398b88a8eed2482b4d00f6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USLZJ2338688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa502fff23a29d4754f402c3b699c6cf07dfb0edf693db6e160f3e16c6105b69. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USLZJ2338690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac2a7a6a924855e0dac3472aa54f2190abb1501ac7f2b59460f4dbcdacb1538. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USLZJ2345340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8266d759a125b1ecd81787f3c1b97c82e1217586ea51bc76b3fcf242b472bdc. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/USLZJ2345342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f08b3a81bd9635b0450e8f171ae89e4ca1c17853b442250c6cd2dbaa81028f2. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/USLZJ2345343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36920c5d786dd86996a25fb80888273aa8714ca572f1dc975464f630d5a35302. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/USLZJ2345344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5910d0099d6df1ea5fbb38d8e2038d9498182c342052afe1547ea2f95b3d1eff. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USLZJ2345345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499a8583279cec69249ca84fc4b57e78d86886ce79a9f43ec13734de1569199a. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USLZJ2438737.