Oh Hiroshima is a Swedish post-rock band, founded in 2009 in Kristinehamn by Leif Eliasson and Jakob Hemström, who were later joined by Simon Axelsson and Hemström's younger brother Oskar Nilsson. The
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 0xa92d59dc70226a2ea0c688af40c8f2c47f9369a92cd1887e36e51ad1c492cd52. 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/6db3ef7f-e6ce-452a-b8cc-12d809d2500f.json and https://artists.proofprofile.net/proofs/artist/6db3ef7f-e6ce-452a-b8cc-12d809d2500f.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 0x83e79f9659b90f85c8e20ed5e6639bd9c66170e00269ad7eb5904287c5c593b2. 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/ATN261987601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8f73902daaeee2168998455f14e0411821e03f131a500432b791d7d71bf9ef. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/ATN261987603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec17d208ea2896563261249e546b07b01ee76e8e8ae87814476172ac45cc3d26. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/ATN261987604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ca4d3435ac6a57676fed0466ef5c11a808b62ff0c65b2b620c734af5e39b62. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ATN261987606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42db4844a5b4ab2963b571f06bef88c0affe89b342624ba484f0fc912f969724. 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/ATN261987607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6177d218ee825bae84db7402bcc14683c3ad7e080914ad7323f5d267b8edc4d2. 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/ATN262211501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2893fac879a5d9b8c7bbf34fb46608d2800f6e9221e259d8a9efd732655aeba. 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/ATN262211502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8163274b6cc75de0111b1fd5e0b8ec51ef023b3d654d49c0f6aabf9848878ee1. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/ATN262211503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b04d74a539d37e07d2245892aa9032e901c857fc62968848d03547b4058013. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/ATN262211504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2476c77119ff92ca5f2afcca8453bbdebb15bb8adaa60c6de5899b8154a2acbc. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/ATN262211505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61afc8c5c473f5821e4e21c636b6cbef5129812e6296396c8898535eafe9537. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/ATN262211506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfa83b6202069fa49868a033f60814ee006e950342334ad38788f4c754cb249. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ATN262211507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ddaa494c9c2183ec37fd2b7011dd27dd3bd515c4c86bbb97288f15e4644beb. 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/QMFMG2370690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52bde51b02f618f51edd57ae70403885d823e7a19a8d46f8d2a3e5afff0ce09. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QMFMG2370692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb36375a9584fc335ca8d216392555d4c83f9c43bbbed253c43b2566c94ffcf. 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/QMFMG2370693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa32aa22792d4e371b5080d95d436c05bcf0837d30248139fea2860f370f8ff3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMFMG2370694.