Quadron is a Los Angeles–based Danish duo consisting of singer Coco O. and musician/producer Robin Hannibal. The group considers their genre "electronic soul music". The self-titled debut album Quadr
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 0x171d0700831b7bc1d16036be36d41e24f75ca5559fedc1c81784f22ba097da74. 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/35f2f804-9a0c-463b-9541-c6a984f72580.json and https://artists.proofprofile.net/proofs/artist/35f2f804-9a0c-463b-9541-c6a984f72580.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 0x35ad850710dc054535805126c09f0d41deb961e9caebb85969424b73950e66c2. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/DKMB30900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477ba7055e39ee5a6b1a6644fd27ab47b4177a32d0edc3229ff3dca915089582. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/DKMB30900202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791ee17f798bf28fe02819e94007e705047376c2c372dceb72fa598decbafe61. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:06:15Z), 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/DKMB30900207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54efe007464f5fa0192686db40df2e57eaaf3c7c8b71d10590d4031380d89b59. 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/DKMB30900402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02b3a670845ffb209f8457b315af526f44ae35ec120785221f6d8b0b183f8a4. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/DKMB30900403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35358ee32464ade47aa26f3751533a371eb32ccfc3631b5b2ad28394ca548ee8. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/DKMB30900405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe59066a93f85c6b0fef3f7bfc0a9787f747c28acf7e0b975e8abe6719af835. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T20:03:44Z), 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/DKMB30900412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2155af45da90a85e6afc886c3b6f18fe42d81a4c42dda9f31ab34b59f6eb71f9. 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/USSM11303073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5ba3cd0b50493206c4589a18cdec0930b234f2f9f0f4df7f7b28ac91dde394. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USSM11303075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afbaf08bd60577c143f3adbbb782fa7682db2cfc37857d18f4a6bf02e8e4c6d. 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/USSM11303076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c05479064fae6f21231cc0338aae535d8876ea9bd48118afbcb8712d2f2ba7. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USSM11303077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf72435f27ddbd5d93c30826d7dd17115473806dc37551204344d97e29baf88c. 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/USSM11303078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff21af125cc499b716bcb4cb799d025ac2299a5a6fe5f6865796ca6bf148c2f. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:33:00Z), 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/USSM11303079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0c40a9d58c21d71947436cd3139651f896352a500f21440ffb87f4f4a2fc88. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USSM11303080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf52029e45bffd398d9774efd3824f84b542ecc8aafc59f5970dfd97567cf40. 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/USSM11303082.
Average Fruit (Heartbreak's Lazy Sunday Mix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162f3cd4f1bb52b6edeae9c4093d6900ae4c2e201685fe5ab538d40b98a81d0a. 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/USPG21100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01fb8ba4a714cafcb05545566015efc07cc4e561d231d824a5ffbec6f6537a94. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T09:45:33Z), 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/USSM11302461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aa42f00cd782508871de8f37039ae93ad86a4e7127f9446e8535df7e874806. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USSM11302463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4dea1179f4e37e7d9e5fee5c0d4d203f68aa9fdabf63771ba659ffd0116c2b0. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USSM11302466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e445959c4259d7d61aaf8d03a1f611c857acc71ea072960ac6ccbeec4d125f. 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/QZH5R2000129.