Langhorns is an instrumental surf music band from Lund, Sweden. The members are: Michael Sellers - guitar (Sellars was previously in Swedish band The Sinners) Martin Berglund - bass Rikard Swardh
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 0x464b6b1d67f7aae1e83a811276098f8dbb5572c680f8ce70a14d35d9a71471f3. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b60e517d-5f00-4ae6-b060-e277d504ea0f.json and https://artists.proofprofile.net/proofs/artist/b60e517d-5f00-4ae6-b060-e277d504ea0f.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 0x53645a771aede49d9572f3c65a40b3e2052853e25a9b7cc8c44fb2bc1cd08b93. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/SEVQI9805803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1720557941f3a5240afb3476523a3d6cd60040e0fa4e00481a262ce5887fc8c4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEVQI9907703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f31f8c84cfde131b0f23a5d7cff97c9eb33497a31a4e02065b56fb17234f5f. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/SEVQI0201201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a6069ce9103c16c837ec3a6f3067920c6f650e8e3f9f9aed9eddca911ce366. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SEVQI0201202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89f79c878360dd91c108ed861ff97bae4acf01e27bab81f2340a4a924bf1ae7. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/SEVQI0201203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e0808e20d38e47803a823ba4bf9209ef00c94ac8f5df38fa445c7442374357. 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/SEVQI0201205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5843791338c26f7d2da71715e958b7273dad6f3f7b54bb756985e0322de5b26f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEVQI0201206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e49965155d6a918ad0994faac44350e57d1a008acd5bce69655a89e21dbd66. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SEVQI0201208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2081ea8481fa5d98393adeabc66c4c6bce4787fe5bf33f0df93a7b04242ce68d. 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/SEVQI0201211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb6290eab72b82d86121d618388701ac3f06ab15194f181a6fab3a599bf9c72. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SEVQI2402007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a846e6dc4c1a8b862ac353bdc2683961e5cde93e97040f794b2446769203f6. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:38:49Z), 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/SEVQI2402001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1fc171728d5b7e11adc843a3fd38f1b601e49daa6834a6172fd1095ed61bd7. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/SEVQI2402002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076fb34d30c815d9df7b6f34c14a4e224bf59d09135c31ca4a659c1edbc50f28. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:02:31Z), 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/SEVQI2402003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1561bf37f2dd6fe0ed4b4a45207467df25e3cd10b014d8b5992074a8232dec3a. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:24:22Z), 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/SEVQI2402005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb6290eab72b82d86121d618388701ac3f06ab15194f181a6fab3a599bf9c72. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/SEVQI2402007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578060fa8e6e8c26c9a083fc4276341ecad5e09fb0e489a5f56f01190f2a6352. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SEVQI2402011.