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 0xe3273f9d17efee85a99f52df62eb1fedb00014951a44e613f9e0ae25c80624a5. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e393cc0-fd99-414e-a3a7-94cd0996a173.json and https://artists.proofprofile.net/proofs/artist/1e393cc0-fd99-414e-a3a7-94cd0996a173.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 0xaf5c6be40adbf7115474c74e278b0adc88b1506ff847f9271bff84cf80b54f39. 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/ESA031313405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e9aa2f4c4b4d7d86f38416efc4e00bc7cafe09d257bf0427b019aa28e87d72. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ESA011591582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9925547b69b22d7e2c428649709f30bb4ef0d5c02c8c35be9de04226ca1ff02e. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/ESA011591583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c68d3e5ccb6e3bee013e2c0ac07946fe2bda28a49ba66d18a018480af328f4. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/ESA011591585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8846db031c8bf23cf074efecb52adbaff1f1ae574443dc319ff52f4553a2e34. 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/ESA011591586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419a6f9f2791d2fd2de1cee0c8e269823da05e75c6cbddd554b74a55d6068363. 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/ES6101700686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383c6862bc1251f18317db7621c4bf0b4e6b4ffd947026bb3b0330da5267edb6. 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/ES6101700687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f3450bff95abe8e4634f0d3c720cc6ed76344dc7b7535fed1afc54cef126e8. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/ES6101700688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2169a1aa8da5b7c239b97aad4018747b2386ae202ac6f9e5b124a946098193. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ES6101700689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60c719029c2940399702e222304b70c43d25fcfbfb3da6528d2338e33f8031c. 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/ES6102000424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf2db746b8228e0756c967e600fe45401169c97af0b0fb8013b47752ed73dc0. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ES6102000425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226da32904ae80ade8739d53ef553f61d5b622bb117acf48f44886c1a8f96575. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES6102000426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99155c6749fb1797ed3e9cce52fc0a9df8b3652b54d7e1809d1872010137cf34. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/ES6102000427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0605fa66b4a1142435a7a082a0c6a77a162066638c20345304fff22c7f252d7. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/ES6102000429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5657179a72bedd0ec63a2d45b1c0af9a6c540a47690e36a6d4161b059a7002be. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ES6102000430.