Checkfield is an American eclectic music ensemble from San Diego, whose style skilfully blends various genres, notably folk, classical, pop and electronica, though their music is commonly mis-categori
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 0xb825be95f62a48ca0eb2df2ee80eb41b79fe60a172494f70b642dd800175d275. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9513ed33-0084-4727-a219-0041923307f9.json and https://artists.proofprofile.net/proofs/artist/9513ed33-0084-4727-a219-0041923307f9.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 0x0cd78c664677e7e1dcd9a1d6d6b7ed8c203959e00ec83a609ac215f161728531. 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/USAAR0010100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e00a3847ac6e669292e6b1e93b267c3d1619b303fbf8b2d206d83723eb5b73a. 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/USAAR0010102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6bd1498d246c62484736d46fcca6a112bf2371872ea79f09c94e1f4b71085a. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:51:19Z), 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/USAAR0010103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0159159b31e70662c9b20f0cd474eb327e72c70f2d9769df8e484418f08a5d7c. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:15:30Z), 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/USAAR0010108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02ce0b9c5d1806d493e24353a7b2fac723cfa7bae46f22e7deaa2b14837c996. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USAAR0010110.