Knucklehead may refer to: Harley-Davidson Knucklehead engine, introduced in 1936 as Model E, Harley-Davidson's first OHV engine Knucklehead (2015 film), a film directed by Ben Bowman Knucklehead (2
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 0xc15cded417d656d18fef463de532f9f985188e59f722278a6d1b4f23b86a333c. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34473e7d-712c-4857-bc9e-68ccb32f8afe.json and https://artists.proofprofile.net/proofs/artist/34473e7d-712c-4857-bc9e-68ccb32f8afe.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 0x28de6b82f3da1ba49289f459ed1fc976465605b16017e9cbd15f279a0dcc4323. 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/TCJPP2153270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f5a92e6dc9e0bce21a148eef15c89ea00c8d60f0cfb3874102a61a20ec59f4. 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/TCJPP2153284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd31781c5e2a07ad5e0471202b355c9dd420edaeb9b6df3c1295d092236491d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPP2153295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5eb77c02ce8e2bda6420b65579cc9175e97d2a229708bb531fe54e977e66e8. 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/TCJPP2153299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5e0abaa2b14f07f3b4f9d0a75999a83fe1d31a82a2f2fe0d0e00a903ef6535. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/TCJPP2153310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e6c4934b57fa1fe46d2c6da6b81debf33fde3b3bd842dcf591c38436b19bef. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/TCJPP2153315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6099cc74f2118041e079de6cdc03710a95c5fdcf6c208274025a8c8957a90aa9. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCJPP2153332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32b2d031a53b20b0a32aa88ea26d02bded24c1424dcfdd748f3c5809caf6773. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPP2153342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba837f2b2e3f929852482f650f840a4cd9a31c9622c3358f5118296f4988cc76. 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/TCJPP2153348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768ef4608d401f46fcc37201efd1de84073feb13c6daa4d2cd17ccfcae4f58ba. 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/TCJPP2153356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2077b2d4fc702efd6177a31954ba4ad90e59c94f3a3e6a600b5ae9a40490b855. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/TCJPP2153362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f18baf1db9f90d4d178cbfdc5c0da7953c930fd712f81d3528bce19fe32aa78. 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/TCJPP2153373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0386608b29fdcaa6d3c002a700f17a127af3535af24522caf4563e458863066d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPP2153380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcfb45b7c23d72f81bd46df748d9d61e1ca76d3a051e27210e0cbaaf47512726. Chain 2 (Bitcoin): anchored in block 958587 (2026-07-18T17:06:26Z), 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/TCJPP2153390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f512f93f02578106e6bc24dca2ffc61f92f66b6f81ebb4b45b639c158a9f57. 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/TCJPP2153407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f643ee8ff48882307637af7c5d383df2e0f7842c5fbbcb2587c9cacecab5fc. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCJPP2153415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9b39a5ed447de17a46e659b89bff4d9f0f1cfb0bcb0cd3e18b023b2921edb8. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCJPP2153442.