Hammerhedd is an American rock band from Prairie Village, Kansas. It was formed in 2012 by brothers Abe, Eli, and Henry Ismert, and the trio gained notability for the talent they showcased at a young
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 0x3f9026885eae31e67832b67da4146cfc00046e5a4cd11c99c05025d3423ddc86. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27deb245-b717-4f18-b93e-fde872bbb163.json and https://artists.proofprofile.net/proofs/artist/27deb245-b717-4f18-b93e-fde872bbb163.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 0xefd342c85aad95770ebe3dca3365eb7a5fdd0475367b59fb202a9008fbeb4e95. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZES51885516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a14c6b62b9d063325ed7f6ef21315ef3b12da36ea189eaab712d5d6bdabac8. 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/QMBZ92268928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a727ac7145b3fbe24aa47fc65d0951c6b81c9e8043404a2ab323a2138c3875. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QMBZ92268929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca450a108dd980eefe0915bbadcc13399af94d79e0f58ec4c9fe1795c058d4fd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWP2551465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742123e32e50c77e1bd4b5ef31460cf05f618ab31391a75e2bf2313d898d7d33. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZNWP2451397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa104444fe91b04114786e13e3d77a1418658a0604de0713ccf9fd1d2001c20aa. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWP2551578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2d192788f6fee838ef04d6667734dae9d1c2eed62c3dfa3f1d62dd2872d17b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWP2551651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa104444fe91b04114786e13e3d77a1418658a0604de0713ccf9fd1d2001c20aa. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QZNWP2551578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca450a108dd980eefe0915bbadcc13399af94d79e0f58ec4c9fe1795c058d4fd. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNWP2551465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07ad57ef82c663520a2fa9c46437e6008e38ea910e3d84b3f84c1ea0a5cffcd. 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/QZNWP2551752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cc3fc734f4ac6de8e2b99eb91fd67131df3f28303bf6909b07b31f289f0a96. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZNWP2551813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07ad57ef82c663520a2fa9c46437e6008e38ea910e3d84b3f84c1ea0a5cffcd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWP2551752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa7ed90e75dcba5fd6d6ef85b59e7a04544cad3b23ad15bc3097954e0d4ed0e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWP2552123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00e77a685708fd427047e0486c4e3c8caf10144cbbea0d97fecc1243681495b. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZNWP2552002.