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 0x536426bb3af0f77b539747a20c64d50b3c73003cd995c4f4a989fd611c383ece. 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/f7e22053-8311-4e64-9a66-1907e72623f2.json and https://artists.proofprofile.net/proofs/artist/f7e22053-8311-4e64-9a66-1907e72623f2.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 0x8b7fbf8161c8df7643806c5cc622f8ca1caefc840c9687dffdb2b4c20926bde8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAGE2222990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35e65c27a48702498d215d4b9bf9be8b8d6f672e7d6d301d0db260b29a43150. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAFX2127539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3f3ecc843fa4a7a6bc28ce19537acf051443bfac145b9cbba1df498d8705ba. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/TCAFR2124911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a039a7757780e70e42e878a7206792a37ac944d7fe010a307f2dd58a283421d. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TCAHC2304218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2806f7461b99436d1f3f7ca96b07404dcc7e63de61fe9c56a25ba33ff07c436a. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/TCAHK2338981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283e000249ed226fd4190e9425dda1e93b84d7a6ebd73d522527a15575496caf. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCAHS2352128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da1ba0aec916d2bf1a8b1d457fe8be9a925a07b06291822914cbd695cabd2bc. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAIC2442373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc6dddf63a89a3e7ee683b87ab0dcdaec502cf8f9225109f2cc8d4936cc424e. 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/TCAID2441438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35849a86da93d1fc6002b32f3a770cc09b84fef1c0c6f0db1b91a63d1159f825. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAID2441444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07a8e8f4efc44b13fbd83ec078ff701f5c09a695c60fd40a340a5c3afb843fe. 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/TCAID2441447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6dd96bf5d65dbea89fa50485e6229586bdd927e6fdea58e91496b73b73e6d2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAID2441474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa7cceec6d6c413cbd2759d692a5e2edb3e0a8a8a1231bc927eb5afce2c1ec5. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAID2441483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda60d0c605e5700afdad5719ab2c22756f0f08d3a6a5bacc5337d14d4a8a7333. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAID2441487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ca92e62f752e7f50a0db38fea0cbef5625235b7f7e67d29e3e08c960755d6a. 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/TCAJF2562618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32e36d9c462494a9319635df5b6f90e366df23998388aebc5e78a709769d928. 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/TCAJW2512886.