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 0x9b5e21aaaa3d789345f7b33ff4a064d9408fbe025b82285beec033577df95882. 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/4d768b15-809b-4c21-9a99-d9ef0d110d82.json and https://artists.proofprofile.net/proofs/artist/4d768b15-809b-4c21-9a99-d9ef0d110d82.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 0x8a83b525fdaafc9e1b1169ff69a4ca7e6583e58785d170edfdb052808d0200b1. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/GBSMU2303651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a35bd0572f06288d92ebf104c79458572d69bf9db5eddfc189323e7d86b22e. 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/TCADH1765361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b30e4d80b352e1ed12c5d43fd9cf2ab3f61fa206890284e78ec63bd9701ad6d. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TCADH1765363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5272c10479d793ef8a1070330a6dd9b68f74560cc62e256e6314ea66d912a14b. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCADH1765382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef09cc3a6fcfa2afe3253f2dcf0cfd739de304200528bdbfb4a9f76e0047dbd9. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCADH1765391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a144dcbb37fc0d1a83f7e99247e9cc86de60aa5c807c50e7eb6bc835b684ad. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TCADH1765395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b48e9cf1070926e72a4562a8c73217c17f17eaae9b62ace36b68340f5cd081a. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCADH1765408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f31ab3929ab42690e8a8648556694156e689730c9587a963524df64a2b301d1. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/TCAEE1985640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850c2b780f411bf41694cf7fae3387dded166884694f38dd13838ee677668b3e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/TCAEC1954108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd808c99a372a408816fdfa013b40e2956e4425eead4caa7de860cc1e40877ab8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAEE1985722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fbe5f4802658dcc84bc841851ee3171765a2d4e4f6e3789895494201fdce54. 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/TCAEE1985727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd944a7707714734ab22d8c6903d3041ec068611e139080f53537ede4bd76abb3. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAGA2241294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27440affaec0c43c0f66221b38571e3fe6b898b8bf27a83d8fffc7cf6972e17. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TCAGC2268964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e9e62fda33353ddc7effb19ec470edd4a58ad8136f19c2fc2578d8639fbe95. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAGF2248862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e784d5b4b702e66e520f786fe30c2d5a75ebf28c0331bd87ed511a6576a7ddc. 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/TCAGF2250962.