Hardcastle is a surname. Notable people and characters with the surname include: The Hardcastle family, principal characters in Oliver Goldsmith's play She Stoops to Conquer Alex Hardcastle (born 197
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 0x86d91ff2bf541d695b68f3131553af4705f4e6ef20c1f530beccae84f2af2151. 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/b58b24d9-770c-4fd6-ad9d-994e38a5a608.json and https://artists.proofprofile.net/proofs/artist/b58b24d9-770c-4fd6-ad9d-994e38a5a608.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 0xfb33c974a3c6f2ec32fa7f5cbf4d23a843008ad0f0d23f5d1ac7c1ed6fe17772. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM24S1845185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9cef138ef46f544f0f66963e7a690ca3b1f8e27c2ca5fad1d216ebd09de9882. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZ93L1951837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb694e824bf444f64fe808f9d436dd95af063d9051907c3ea660ddc4dcb2a8dc1. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZ93L1963820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d22c9e634da389f648f199d679d987526c83985e234abf6b265bb147bf73381. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QM24S1836179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfe4ae2b99f11e1d598781bd96aadddea7894ba7d0f5d478f423b833c73cabc. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QM24S1841217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa5ac9b8f899e1b2be59ca7a5cef4e047a315b22a74fa9164b090ae771f7c71. 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/QZ93L1976264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207c9a07ea80fcf311130555555a6b83341e4bfaef6adfbcb2cfbfb7d92f3982. 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/QZ93L2009750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc757ba02f7a9c1eb6b3d27d7de3346a831da4f4adb21b0edf048a3f2314215b5. 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/QZ93L2018359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f6642d7d12e166f333144e403a57f340ae254915d461fb5324e64b08fe39c8. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QMEU32123218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbe36f69d7a993ae040ffc28446a351d5f3e2075cfb8812938a145bba664b5f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMEU32213596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13739e6e6a12863795e50eb9bccaba9952e6921ef413cc67f8f4a7a8ccf6694d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QMEU32214507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f65791b935bd65d266f253ef6d41cb154a2392fb54e0fd2f0d9c4d9ca1600c. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QMEU32215988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4286a9939974e67606b02241cd20bc28bb099a9c591dd6195241a84d8f744369. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QMEU32215986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a1fbc2586e97e85b5dccc3cb8d6c127559f423b972d99674eabf0764b5c106. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMEU32215987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c98102a00ce3fa7812dfeed8f36abc800bff2eaabf0bce4c4efb2ce8a350c2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMEU32307298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb2c74bcffb74447fa5e250dfabeba015fdef5fbab44524a9d0d1679d193b1c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QMEU32404934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71dd7a9e919d5b999b2f553aa556fbfa67a280395caca8a971d71ccafdc0cf9. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMEU32404938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1026b116fb125b5b4d950edf687261393b9a4321647700c5c11cb74482112187. 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/QMEU32404936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2556298dc4fac59375645b0094c70b4034c059857d80e4297ec2fd75f00d4b. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QMEU32404937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1babc04e90edc2fcc4a077ad48bed68d47f0cde513474a1a944d222a345c2bd9. 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/QMEU32404939.