Quarashi is an Icelandic rap rock band from Reykjavík. The group consists of rappers Hössi Ólafsson (later replaced by Egill Olafur Thorarensen), Ómar Örn Hauksson, Steinar Orri Fjeldsted, and Sölvi B
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 0x64048cd6bce95df76938d210e876e7291de0d09cc969c3009b9c58bf49bae088. 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/b19f55ec-7056-417d-8f90-65b1795ccd74.json and https://artists.proofprofile.net/proofs/artist/b19f55ec-7056-417d-8f90-65b1795ccd74.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 0xd58381c549a6f58c4f8fa2e7a553c4b485c0d1aa888b91aee5005fe2e9ed31fe. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/ISI119900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1414f385dc4ac266519a58d96ced7e001aae9075ec22e7c6f9c2fc4a020c7c6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ISZ100203703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fe39239727be04a2082405b7bbc18f6e38b837c799766f367c818374e3032e. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/ISZ100203704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd200aee02e37cf7cfa65740048e2d11835afd73bcd7f024c2c85d13d0e8120e3. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/ISZ100203706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48d2c73ab9cfeea1787977680f2b9fefe4edcb1eb9660a6c13bdbed00d63025. 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/ISZ100203707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df7d8f5a3ae124112607ec9289f9a20b3b47bacf396ba79752978d5f6a72c0b. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ISZ100203708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d48a58a8d489067b4f44c65a0a15750d4c99afaf030029bae2d4bc7c7cd2fb. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USSM10113583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc9658cbd905fa0ffddb107b6d17d84b9ab897234d76651bd1ff6386c2256af. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/ISA110402701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe674fa990505a1128e0ad854239cc087b46678849aff99d6ba97c54200add7f7. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ISA110402702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13265a76ed12a1f17d34e5c7dc54cdec52c99858425fd7f25cc04ca3329fbd44. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ISA110402703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7444278f9965bbbd719f9e03b0991c3a26f71c57b851df886d8dae44cceb673a. 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/ISA110402707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b7e2ca89bda387802b10aaec0f2817a6cc0d8f7983eb59a3d48f6a8ae0da0f. 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/ISA110402709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa069b89ad228db6f9a1f242adcc471f7ee182e2821e3b420ea3d2ab6a09c7de8. 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/ISV441106804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f27c00ca7d8f0e17e28053e9a59c4a4765bc62cda0ba1947652819d78a909fc. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/ISV441106809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfabc490ef75a0541fbf67bae36ba06bd499f3faefc2a49462a6e1f27d3c05fba. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/ISV441106914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1414f385dc4ac266519a58d96ced7e001aae9075ec22e7c6f9c2fc4a020c7c6. 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/ISZ100203703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e8c9c13c992b8e602ec3c0af09b24569bd13f17e380c8b665a0543803c6a7d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ISZ981100422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ba42d5a2bd17ddfb401a0105df49874c7dcca66b580ce254391a568c8b973e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ISZ100203701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a34762dc69c2c5923c5a30488b60ec7e52eaea43b157cadc0344710337b9e64. 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/ISZ100203702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ddc77fb7fd235d2cf00765e9efa8bce6930644fba4d2f4bc2171a17c332b76. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ISV441614301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0225a9363cc34ac14404ab435933aed536b0f1c0f394c4af586ca58d7be42b36. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ISA111102315.