thumb|The Vampire, by Philip Burne-Jones, 1897|alt=A black and white painting of a man lying on a table, while a woman is kneeling over him. A vampire is a mythical creature that subsists by feeding
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d7b407046f45118c51f0f9304668873abb74c0df04cd68d10628bca34be7d7. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b362a76-c94d-4c7c-b671-ee4db473d46a.json and https://artists.proofprofile.net/proofs/artist/4b362a76-c94d-4c7c-b671-ee4db473d46a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afbb19e6199f1406c7fbabefcb0e7780f56f9d2fb89ca202fdde729afe331c7. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ESA012521382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89e0e737dea750538070fc38efec6e82b1b7469b520fb92843a7405f0fe7a87. 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/FR2X42564662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0b7072bc85727483d3f1e5fc122e490f38a478cba8edd3978e10b642a9c199. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/ESA012530196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea36dce1cb33a120355764d42fedd949df2ed697686a6f8ab5bbc64696a51764. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ESA012531438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b846534d41f7f600cfbb5dbf0125470a7bf8a6d4ca32d3fbd5fca5903a1d44. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/ESA012542603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c563edee7a353142fa0ef025d592abfbd14987934b5587e73135492046d94dd. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T08:08:59Z), 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/ESA012554095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15b713cb3a2a731652b7d31691db700f65dfe87dc4d769f47dd91d2296fbaf8. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:30:03Z), 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/ESA012569876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b5b0131ad8afd579f7ad76d1f93e8cec22531976b4a7ed7fcb9e6c8702865c. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/ESA012572869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8dc342d93674b98af13fc4d7b72d3d5cf838e684c64dab70a56800201de1490. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ESA012574831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a76c8f8c163a04543ad1426d16aa87a531cb65b7686f979c7a3e09cda27a139. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/FRX872522489.