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 0x641a6ad019cf640f1df04398175ce9c65db46102cd20c45fb3c83647be62b780. 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/bdc5b4ca-279d-4e23-b91e-5580597dea26.json and https://artists.proofprofile.net/proofs/artist/bdc5b4ca-279d-4e23-b91e-5580597dea26.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 0x57644fce462867793ec7e4c16d83e453678a70dfbec9be7673e00db62156c1da. 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/ITZK52100462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794a134cb52fb158ff580079d504b492cfdab4dd7b00d51d51348a9df2670267. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ITZK52100414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16dbbe69b18d5171d0f789762aa5a5ad2266ab18b5bdeea78a9bae99884b2fe. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ITZK52100465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276ac5d4abdc94e9e2f3f3438310f14c3780f3f92f198272123514fdb29ac02c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ITZK52100456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb9a33488ec49c37fc24b069259f404ef2c26614850fe276d391934029b7781. 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/ITZK52100436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb785896be69a9165f0da303bbefdc275e7ad050575b5ecb81354db4aae45ca0. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ITZK52100421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283fefae1c90d5103888921cca498db9d6c68dd7408169ab0514d94676f93e0e. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/ITZK52100469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5f9ee31a5c0b59aa87dabdd7a73ce384492f794775b64d287be172d1eaad84. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/ITAY32100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35d0dbf865cec235fff3da87bd9400d9b3da2b1cc7470cee06756956762b0c9. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ITAY32100089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2272a51cd8e79f5088c0bf1cb24c554db67996655affba24e8b3228558ed4765. 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/ITAY32100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80bb7ee6eca4dda809a01f06d905f0df3b9173fe83003561dfe10da3394aebe2. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ITAY32100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35d0dbf865cec235fff3da87bd9400d9b3da2b1cc7470cee06756956762b0c9. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ITAY32100089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4677bdb96cde786525d747c873c72a7cda240e7cec9f5b7ae650edf371eb5ee1. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ITAY32100084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39a555b1eabcfa0251e4b89d92530e35973e45b2552b47a4195fd1b22cba357. 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/ITAY32100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d6e22960d246bb35d61f79b606f533aabc0b89fdf36b0f3a389142e39c369e. 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/ITAY32100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf785f1ef85bf48ad01701424fbf9d4dd30b86a163dbff60738ae206fbd7477b4. 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/ITAY32100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4d14aa7ca83fa915d1250a4f892a411aac431804627e6dd5e89c7ad791359e. 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/ITAY32100111.