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 0xe2ead1d518b8bec0fd74f33674dc20ff325843d7ae4ffb741b56c7ef3a3e2b48. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e32f32fe-0bbb-4f33-b6eb-0c57d191b99e.json and https://artists.proofprofile.net/proofs/artist/e32f32fe-0bbb-4f33-b6eb-0c57d191b99e.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 0xded8df82dbb63c9b7ed699f91171a5cf895644917a00f8287063a53dfe49ce60. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/FR10S2514870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341a12847a0329a82509848fe4d1daf99cb3c5d8d63a0eba6270ece11fa435a7. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/DGA0R2470741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635b48fad0c0812cf061d5a7a7dc8399c26cf82e552bc9595c76a6e37b99fd03. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DGA0Q2428345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df7e904295bee47ba1644753c5ca0c187ebb52a898a5561091aafc01130fb08. 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/DGA0M2488909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2180577c731a5eb7d903934c6a11484e29582b71e22b8e52ca466de6dcdba2f0. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DGA0H2411182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0d623d76eaa4513a16ac64a00cc1e7d912946c69d84032e4f96c9af1cfddfb. 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/DGA0M2436248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad89e169c4ac70b3d63ca005ef8eb7a2a39a52ed9987885140231e5cbc45ff9. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DGA062448356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da3ba20101c3062b563856116da0dfa3d75a33fab8647c9f84ba776b4d6856e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/FRX872491879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89d1f6c3647843b695ebfc302825d445ba530332966015c3187ea23c63e9e77. 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/FRX202478293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b624210ec35517eab015a02b3046c44a0024281c2f99a89f2ad0e751209d4e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/FR10S2421093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468a87cdeaac6323ca48bcad173f4535b77b5f1e7bfbf51eedb1648156149162. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DGA082340084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386ff050525a17eadec26a0c23309aaa3ffa4a96ae2f8e193e43b4bb66e60bf2. 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/DGA082334184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce201561466624fae0d029cd1181ea273bc2d9eba02f7847a421360c5b4879c7. 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/DGA082336721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147397500d2daf17bc696ab14170ef82c700f8a50220c6ef89bcb02806ee29cd. 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/TWDL72206115.