thumb|380px|Machinefabriek performing in 2013 Machinefabriek is the musical of Dutch musician/sound artist and graphic designer Rutger Zuydervelt. Biography Rutger Zuydervelt was born on 28 July 19
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 0xf3ebfa2365e23adf0094ca8898c42f3163d658e8f82a238e47d60eccda582e68. 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/b27b5119-1572-45d9-bd34-5ce17176a57e.json and https://artists.proofprofile.net/proofs/artist/b27b5119-1572-45d9-bd34-5ce17176a57e.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 0xfad536cf17bc28d8e217c119dd9d35e9ae37089b85fb0d263a0d64a4cfaed8db. 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/QM6MZ2439113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae63453b26cfba229bf055a8d19611cb8db5aa0afb56bbb067f8ff699e20307. 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/QM6MZ2439115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3be0fbd21fdf30dcd34ac9d9841bbd3aae64d8efc4a1a1084f9d8623acc047. 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/QM6MZ2439116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55f4734084682d130c45d79004e3467ca3374229202e42bef9f57ed04cacc0c. 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/QM6MZ2439117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510757aa2f07fc32ab39060518ec19ad3228ea20f98310d106b9237890bc9e08. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM6MZ2439114.
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 0xd36417176aad7d41cb75c00a7a7dc2b19b128533646faf5782b48d6b2d416d78. 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/QM6MZ2439118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8175e345941e8571ca257424fa5fa5f294e52caeae4bbd4c11967399042dc9a2. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QM6MZ2439119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec66f6562ec7f1b98c2e86a29bd14ea32aa6a2633e7f9b4ed3ac8454cc97e955. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/QM6MZ2439120.
Our Arms Grew Together (Music for a performance by Marta & Kim)
Re:Moving (Music for Choreographies by Yin Yue)
Sahara Mixtape (Original Sahara Series Soundtrack)
Engel (Music for a performance by Marta & Kim)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259dd26c8c6c0533843319d82c5c8f18b86e0481ed85a6c1221ed4005e8032cd. 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/QZDA61834110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8991379e977f51b12ec8645939dce6acbcefd1562306292d99a3ae60486f9fe. 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/QZDA61834112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03cc686a526a4098324567d2fee3385f3bbfde1f275efd521ee14f2315ffb971. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZDA61834111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6737796b375b5eb052bd56af1f120d20c779b34b7fb794faf8f8c332826df5c. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZDA61834115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd973abf82b74279322763796d9a9d0cd1deee1d8cc70bbac00cc97b97cd9eaec. 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/QZDA61834116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed4f7c6b45e5a0182d75e7460d4db080f8ebaa014ec82b34ccab0c37e87878d. 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/DEZ651722503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8509db3daea17097529d48b6d6d2c538055fbf04ca8b437c234dac66408e2bd. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QM4DW1637600.