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 0x9031616108273977139882603afbabd64d77c09cef3a640a615339016079f204. 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/c6791793-9bd1-4789-b07c-f172654fee83.json and https://artists.proofprofile.net/proofs/artist/c6791793-9bd1-4789-b07c-f172654fee83.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 0xb50da23c0a1eb76fb633997304533631f17ff155fd9c3e518973d8bfa814f5ac. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/NLUB31400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd53ffb3a96a262fcd75b59def1311617eafe033cd8dc41ebc6eb0b5bec7948. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NLUB31400014.
Nothing You Can Do (Live in Concert '17)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7305c583951eb8cb8760aac27f2258d80de95f00c1e912008cd3fa47925f946f. 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/NLUB32000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60daf0e5b33018382b4c2b450a02f5525fb5f295008a4890182b8753cdc19ff. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:56:29Z), 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/NLB602300249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62f76b0be53ee8fbba6d88f21fa21b995e59163edb885779ead95769cb5b34d. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/NLB602400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3b59516e878d9f7abc919af99bc684a408f5471ba3f3c324e4aca95f01e316. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/NLB602400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fc2e315302fabebc8e97d8a25bc15f72ccfad0dcd8054ee084f74b98a7d6f9. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NLB602400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c730467484ccd397c5dec9570baf967dc158e8ea9d641e8cc14c99ea611e89. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/NLB602400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8cec7f4bb07c63e73377632b88180e3058b8b65186d5a5f071a095fc64415e1. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/NLB602400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839533ccb03c39c8a93f05874254b6a9fafc4ed2ce9ddc981e12303fcaaacbb3. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLB602400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41649f56d3111eca4653cff5eaf72a375fe737acb3ba57348e32d829591d2f15. 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/NLB602400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6e84237d9e12f6f09b6b1c55a3f45a6f34dcb2f9ba852d97afd96c02bbead8. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/NLB602400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bcbdefb6743ebcf551735ca33ac99569855974c1496281784446b094be7099. 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/NLB602400041.