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 0x80633e97d726c6a010f632b400d3303a42b40226e9f560ab17ac2a6e9499a819. 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/607d9804-033d-4bee-a377-993384ded807.json and https://artists.proofprofile.net/proofs/artist/607d9804-033d-4bee-a377-993384ded807.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 0x1a985e3cf20620758053de5119583db36a3333f0965dca9c6d3812420269b94b. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/FR9W11605700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eac16431a9defe273ea27467dd300ddb7a8e0e25de691ccc159f5344ca051de. 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/FR9W11621263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ee14ceaf707990b7b190a5a148f0a2f2e3058223f53af801d79ce8232faa27. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FR9W11605696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b167443b07c2c8c8cfaf5cdd602abfdeaa2c2266d34abab9a6c8e93c53c8f7d. 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/FR9W11621265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc555d385b27f279281da2188980abd062b84b799730793acc5861214e9af988. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/FR9W11928399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbae23b9c3cdaf8b66d767253b04dfd711cf8e5b5cf7ab584b6b1e78ec6a6fd. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/FR9W11928400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca4cca660f39be06520cdfb9e40b1bab93e13fff72f75fc8e13658ff3416cbf. Chain 2 (Bitcoin): anchored in block 957624 (2026-07-11T23:13:54Z), 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/FR9W11928402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96efed4781a888f9ba849ad9c12fc8b5df0d51e3cd457c1e4bb7e4356322d754. 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/FR9W11928403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0ba773ebd46b7eb84850de9881c74dd50afb0bee63874c89bfe8d5f54fe7f6. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/FR9W11928406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb870f6a612653178f9d2dade5c36b15c19e75c6bc8877714ed70867b623855b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUS12000631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8983104b4694cb0c7a4a283fb82aa68cdf66cceb4b311faf65b60c7cc5048a1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/AUENW2100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb336fbe284a21d33cf175981160e157a456eb740cf3ff540f91d91341cff71ca. 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/AUENW2100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b66c0d2a37932199387714fcc0799b7ffcc5d3ab0c4448e791b21abfbc1787f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/AUENW2100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe250a60a329fdb6ffe1c6335ceb1d1882ed61177dfd2dc90db095e7e4d77dda9. 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/AUENW2100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb336fbe284a21d33cf175981160e157a456eb740cf3ff540f91d91341cff71ca. 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/AUENW2100040.