Klangstof is a Dutch indie rock band composed of Koen van de Wardt, Wannes Salome and Erik Buschmann. The band is based in Amsterdam and signed to Mind of a Genius. History Koen van de Wardt (born
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 0x3afc8490930469489be525f3b73ace55a84bef0feeca0a41f8b0494d3dfdaf26. 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/dec69c46-8038-4fea-a7f1-e06db3c2afce.json and https://artists.proofprofile.net/proofs/artist/dec69c46-8038-4fea-a7f1-e06db3c2afce.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 0x41d2563f54841d9705af220168ee1b617b1e724c91ed735fa850f073fb1cdc31. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BEHQ42190039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58bfafecaf02a23bf15cac00e80af232c828b12a8b126ac1fdd5b4bed430c1f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLSB72100275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea267e357d1f59022e753ac3719490542ed1a2f50ac25a2810826545907b81a. 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/NLSB72100276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4971369c0365562f2d7dafb67ac8a1b7c2bca22b4562e841549f37bc61fd779d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLSB72100277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713bdfc7f8042d8665b744362cc49b05cfe54cb3cf21ab93b90acc6cf0fe25e9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLSB72100278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31269cfa681ac9271767fff9992e3be129efe8c1ff2cbce9455079d15e8ce905. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLSB72100281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599ad0bf5880c636b46eec8d752dda282d1d630e5c47bbf4d2100a0240722f78. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NLSB72100282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc6c6652303f44f58a3d506c65f5f2029261c5ccbcfd11a74e2e1fe194327ea. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLSB72100283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf31009d4888d762f99ff3411570beb5c2c30546c2ddc7e5e950073715535cae. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLSB72100285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcaf12cc9686f19d4a393f68a42dc9f4c37e032a73289143b7b4308a69e0f57. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:51:25Z), 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/NLSB72100279.
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 0x04a5cc1a8d0b70e0d5f12a80e8f0c1a8aba44bfd4cd4cdb3a1118900b0262dda. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLSB72100280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b9eefa6691d0ea6f834b94f7592107a5b3e64e5f3078ff853956c3be4897bb. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLSB72100284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc33fe4a2ff97e36ce137ef7ce2aecd9d198e93788aed48485d9f9e6229ade40. 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/UK3XT2101145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea55073808aa8e8980529055ad2e8bc93197e38c323b273e20c429be6be6c3c2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/UK3XT2101146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9435292695ce53ce13025f8795b673975b2b8226274531644ae8bd727ef9c4c9. 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/UK3XT2101143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d3f786cf07a555cff754b1daa05bd4e6b162be13c4232d8fa9cf0b64df55c6. 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/UK3XT2101144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa458d31f025fa71a394d8907b0b9a10d096762f140196c9839b5fcffad7ceb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLSB72100170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bda0c0b15cba23a09980525c967824c7b23e54d88bce3560d7ed7bd79c09e8. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NLSB71900169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6314b68784203609bc1be432e1643eb963b98dc1d1c0c71ee35f0fa7c4c547a0. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NLSB71900202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a6080814606efe49242740f855b85676c2b33a0a9a141d8d039d452e5b8f0c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLSB71900203.
Here Is Where I Belong (Klangstof Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fdbee04e807be5faa1fca3a8dd5eeed24a6d9eacf984cffcb2f26f0e7f7aff. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLSB71900076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eef622cef4ea9ab00c650888e9e19e44afa35e997f52ae785eecb57d3937b4f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLT2B2300004.