Efterklang () is a Danish art pop, indie rock band from Copenhagen, formed in December 2000. Efterklang emerged in the front half of the 2000s with a blend of pop and orchestral rock elements. The ban
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 0xba6f31381c2a75293b5aa545a08c21d07e988f93059eeae7bf1ca66d12052cfe. 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/268fd44c-6cf7-47a6-b446-4c6e4bccc121.json and https://artists.proofprofile.net/proofs/artist/268fd44c-6cf7-47a6-b446-4c6e4bccc121.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 0xd9a224d784a60e715de446f9fb093f8ab66b97ff1f8665cf2e8c6d8b40099eff. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAFL0900159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8131c98b4f1ab8b6df8e21953ca46711da75ea9c74bf4309508cd2b3d825156. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SE4DQ2201201.
Breathe In (Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba4f53d4a9677d87a78f008f54ef8fe6acebf8a000bcbd07f8b61f4bb8787bd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKEF50900311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca2c56bb28942de96c36eefa41c373950e6f437c87996fca790b4fb5e6c0eeb. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DKEF50900301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945017c367766705299dc843f19f7d93680ee015d8047c4fb815325fd097bfda. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DKEF50900302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83cda3ce2d20992efa891e007b5be0a7d677a4652a815ffb8567ceba0b0db667. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKEF50900303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaf1a0bb248cb72935723702d61ff2e91eb95668938f793c4f712527869265a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DKEF50900304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723849782468c707ea56eb70f2144beacc943d4d06b89b7acc3a3fe92c367189. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/DKEF50900305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc2cdd37e1ede08de68d41d9448c8dcb9ef133b9f6621e33e5eb348359551aa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKEF50900306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1c5b319e860e084bc984de47a304db8e5e170efaeef9728d810ad1f6232bfa. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/DKEF50900307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeeb27dd815a571e0bd4f98be6f78cfa5a356dba7ef128eb4e715ebc2065f8c1. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/DKEF50900308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38af0d0a134bf405997f4da19838da82c9efdbee619367288139c9d1330a4532. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/DKEF50900309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179a066f876a6f0708d14a95b98d6c238c153a7704e8381442c37a22d6167470. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKEF50900310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba4f53d4a9677d87a78f008f54ef8fe6acebf8a000bcbd07f8b61f4bb8787bd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DKEF50900311.