D'Arcangelo is an Italian electronic music group formed by twin brothers Fabrizio and Marco D'Arcangelo. The duo have also performed as Centuria City, Automia Division, and Monomorph. Their music has
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 0x7d46fdf173c65d76a2f20fa327dd8aa1697cee5ed5b7e62b343d2dd0e3662393. Chain 2 (Bitcoin): anchored in block 953972 (2026-06-16T16:31:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a8dbbd0-d070-48f4-ad09-6a9b1d42e4cb.json and https://artists.proofprofile.net/proofs/artist/2a8dbbd0-d070-48f4-ad09-6a9b1d42e4cb.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 0x708311e561f46ecc621efc7ce370fb35401b171501601db1a5765a3919e13df5. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBQLP1901082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574f4e5714ade874f34d8507db59a86ee0ebecfba2921982017d98142e36cbf9. 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/GBQLP1901086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1751a5fa17a3124172e6b060f1fb98853f8229a657cb8739df69f0ec4e0f94cf. 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/GBQLP1901088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3798006ff7331249a3d954b23b38b26fdf1f0b18eb5591c2f40b97e568ea00a3. 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/NLL561002641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92aaa27a0c4bf01edecf19e42953d5120139f0083e73e04715c96ccf4c964ef. 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/FRDX62401460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2267400c5f68d2db03c6d73db4c662d769c02ca17e9e1e1673a8e457a9f692db. 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/FRDX62401470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9edcaf659d28b4a88a115c98d9dd5d90183bad5c712ffb87228ea836d410b5. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRDX62401490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0500f52685ebb90cefebf63c119508fe4e8a8faed2a5a306025f8c71997c18. 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/FRDX62401500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649b8f68af5c3b18ebe6dbf1ec1886a2cb6e8139626cf8121775d978d2da0358. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/DECY52200565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d52fe63e917a9ca8c39bb166898570bdecc3e3e4dd854f41b73ea821a66ea73. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DECY52200590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c83c90331a8777314bcb04752298ee5208d12cc6ec48c44447790bb565da0ec. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/DEH742042984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5274c8a32242973473934ca3d8222b42e966c01f8ede12e471fde4fb5b769ae4. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/DEH741515673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13ffd537fa6414c399522c5e4015fde67fb626a36b2c635a80b4193eb2d9c3b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEH741515675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e24d70ac9ddc35b577901d4016b81ca823e25ec07650995f41b528748ba2de2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEH741515674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4822bef78b756d8c8a7b50cd9c8100bfa033635ceca7bbf3da7d6c2d734eb368. 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/UK4US1600035.