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 0x548eaecfc2ae15320f2c0da000c05a4ca264f8adb5fcd15b6a43da787534cd87. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f718857-03c6-40a5-ae8d-f46b1f24a7a1.json and https://artists.proofprofile.net/proofs/artist/5f718857-03c6-40a5-ae8d-f46b1f24a7a1.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 0x41eaf79328387dfbfccf58c80661b3a7f6f0c3f98780bd2a88a69af3901e9011. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/AEA2W2556044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d57037a5098b12f5dec4891c4136589f8754c796a9a2a4b434539f13024b0e8. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/AEA2W2556045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105243aa6b2b09176dd812c1332a9d2d7067c1587ae5393530eeb22dde51b323. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/AEA2W2556048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c2768da0ed416c997ed1bd2570dd75e7004edff8cc3f290070275c70879209. 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/AEA2M2512495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6535672c1e29ac7ab902fdfd724d84afb6f8a90fcc9811e2ad16cc6c45651a. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/AEA2L2192407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460d21100d87b3a49404544d3ccf8ad65c646ff862178d0e185427edf2926731. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/AEA2L2192408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095399d2a53992f8e60a124e417dd43d38cc9ae4302a92ca84ba868a13418b1b. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/AEA2L2192409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c913102a8416ffa2e6579c01a915e5164b65d060dec9e8e8c377bd004e2a9a. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/AEA2L2192410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43915344d6976c724a9e8539b7e058454e807ea91237b2aaa07688a5008f2ef0. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:08:55Z), 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/AEA2L2192413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5fece9a560ea742f54f6a033bda4a236bc0cf643b23b2c011a7b512837f02e. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:35:36Z), 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/AEA2L2192415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2947b5feb1c4d4d81323311496e8a2d0083c2aecb906d8a8a24533f162fb172. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:54:08Z), 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/AEA2L2192416.