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 0x7789deecfab285c8a4f9032f86a48ccc1c1d7d0ffa322c9e44a4bc1702718b26. 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/e6d90c5c-765e-4a53-8356-e07526d98329.json and https://artists.proofprofile.net/proofs/artist/e6d90c5c-765e-4a53-8356-e07526d98329.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 0x5342fa33e1110a4c72fee2141c84ff5513c7167c9cc70b6c788ee54e9e1c3807. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/ITGDN1500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0bfe4adc6ba926fea361bb11e622f23fd1cac3ae7d69a220f24027461a4237. 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/ITFAN2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0799ac77cd664a0664448545aece7b5c688bcfd0753f9c74d1d57a13ea81cd4c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ITFAN2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce02ec3822bdfa84b35d051d9d18a754c6ce9ab6830267b9948567b1f37ea02a. 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/ITFAN2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b95249da2c54c903063294d915a090bb58e82fc804893cf6f0b4af923a825c5. 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/ITFAN2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f07430c6151c0d74db41c0d5e13f735ff83e74a29eda5bf252d51c8116f4a20. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/ITFAN2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ab5f97362714877000b1b1b9894bd3cb4f35177f56506196e82fb44bb6a2a7. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ITFAN2200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6484a6941543bcb40cbf8af583b2074d9068c9298cb1aa98f5ad4f12c1d54d. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/ITFAN2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23cdc344459f170ea7ca9dc81d48b120cbbbbc85e4629f40b8631dfa9b21d03. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/ITFAN2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa869c493ed67b055d44bf8fe6539a0a73eae956f0ec8f55a00b63bf4930c9c7b. 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/ITFAN2200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce02ec3822bdfa84b35d051d9d18a754c6ce9ab6830267b9948567b1f37ea02a. 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/ITFAN2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0799ac77cd664a0664448545aece7b5c688bcfd0753f9c74d1d57a13ea81cd4c. 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/ITFAN2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0bfe4adc6ba926fea361bb11e622f23fd1cac3ae7d69a220f24027461a4237. 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/ITFAN2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7ddb7768d8fe017c58b8dd02bb923f6a031f5ea3e6a324c2dad864d3239a99. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ITIWE2490096.