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 0x897c03502fa484ffd2bc47d92ef222b0b6843e65280fbb4f9960229ea6220301. Chain 2 (Bitcoin): anchored in block 953627 (2026-06-14T11:43:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3000def4-a343-49e9-bc36-75b6d62d5599.json and https://artists.proofprofile.net/proofs/artist/3000def4-a343-49e9-bc36-75b6d62d5599.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 0x022b44c21a1f30f48bc4a57a1b322bf0ecbe6eed57a34426a60ffa15a0aed8a2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DGA092216598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefa1f95c13c4810d3f435367ab48b4318e4998e380ceb0f1b8752cd1af155e9. 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/FR2X42293514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2cd2f148e16f74fc6ead69cc7fb732aa74a5699ad07596fb638e51bb762798c. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DGA092216599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d69fcfcc95b0afec64defb036093d36f7e901f4a8a146bba00d5a4f3550ec9. 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/DGA092216600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ae14b72993f6485312b5b3974608c66f446f909ad1b383f52e151bdfbd5831. 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/DGA092216601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7934221230a8265db2d988c1d326f0ab6f9eb0176b5de9e311a1876e80add289. 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/DGA092216603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db7067af7a35dabad1c97f3039ca3247a0c605288fb351b85fab82fca3ad854. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DGA092216604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746937e4f1144741b1bac629178dc2ba992b55cd4f7c4e106da696b4b2f778f5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DGA092216605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbaaa8364eef96ef8e3f1980d610e5cd79e70c0ac3edf6f3666c9008ed5dfbd. 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/FR96X2266296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa387c1d8da2b4a05ae6ecd0d23c72231a3c99e5683e7147ff44011a381ad7ec0. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FRX872218761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbaaa8364eef96ef8e3f1980d610e5cd79e70c0ac3edf6f3666c9008ed5dfbd. 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/FR96X2266296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefa1f95c13c4810d3f435367ab48b4318e4998e380ceb0f1b8752cd1af155e9. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FR2X42293514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3965d1f09bba05f42a6bf25d080e438fe5c806312fc1060ef7dce75e33f62e69. 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/FRX282142802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d84f0d7bcfc53e893ae4238805473a8fb6dad4e1c7c7f62c07e8c8c5fc700ad. 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/DGA072118592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c71a13921d5b38e4603cc711e7fba25680ea14c692063da145b994b6779875. 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/USL4Q2037535.