Doom Unit is a Finnish rock band from Tampere. It was formed in late 2008 and became famous since winning Radio Rock's Starba -competition in 2009. The band's first single (entitled "Killing Time") wa
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 0xd644e53e57a781b0c7ed3c279a06c1c926a29c50a1a1bbdbe646d7ff2b316c27. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef344106-9960-4c51-ba62-c9d57505541a.json and https://artists.proofprofile.net/proofs/artist/ef344106-9960-4c51-ba62-c9d57505541a.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 0x2a3f2f176cfb5fc3b4174f89a04edcf6704802e3b310c3023d076dbdc13faeb4. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FIHYP0900049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a02ef49733c112fb9d93f2f0b70670ffb8bf8bc6cdaef41ed3185edc9202eb. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/FIHYP0900051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9853b5e0c2718aa7dccf9841b9954502aae681e88c1778145f3d6603bde202d0. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T04:16:28Z), 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/FIHYP0900054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ca49863862c1e6a3a1efe785cfaaaa39f50faa9aa58e813a1b18080fce9fc3. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/FIHYP1100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ec152787f1e428c5c2bf3c3e601dbefabc1fffd0106ea8ee068d6a4bce2be3. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/FIHYP1100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed77442e4dbcb739285480b868af78d67b4d157565f6958dde37870923870a7c. 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/FID2U1700001.