thumb|Quadflieg in 1998 Friedrich Wilhelm "Will" Quadflieg (; 15 September 1914 – 27 November 2003) was a German actor from Oberhausen. He was the father of actor Christian Quadflieg. He is considered
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 0xe79785e06c37f4f4073fafa897533e2b10866b0b05c11e937ff58ec04782698d. 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/76f41fac-3216-4f4a-8351-cd828c718ae3.json and https://artists.proofprofile.net/proofs/artist/76f41fac-3216-4f4a-8351-cd828c718ae3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Wir entdecken Komponisten: Wolfgang Amadeus Mozart – Das Wunderkind
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 0xb1efa676e6778a2dff830beeb7f29573b09d8b6616705d8b145c650d2e87318a. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEF058231601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5fee98c080099e1ef3b890053d9210f4dfd0faab62073afe43c865bc41d902. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/DEF058231602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa799a0d0459888729ff6d759decf4a41f52153ad9ebe0c5a05bc5ca00cf528e5. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEF058231603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6d3a11196c9ba5cb977bec1b454bd3427cdf837e28474ca665b2918940f16f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEF058231604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcae36ed5bbbb6bfb9326f2a4585ac4d4efcea265e482e8dfd921b981a5c6a5. 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/DEF058231605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b35777984230c8fd925fa4cab05567ca352829919b98d0609e6a3874cfb667. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/DEF058231606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a8faca976ef049c34eb021b427171bcf92d7bc779d148773e5ac9630db831c. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/DEF058231607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1730c765f49f91c0fd04882313da0ba89dfc8fbdd2302cdf03a25361a9afc85. 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/DEF058231608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8db74192aeb55554bb22fe1c2285784b1f3fb3e61efacf23b8b248f94e0360. 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/DEF058231609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278c0756851893b67507c530f4676aa43bad0d9cf285e344fc0a72f6bb5c7081. 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/DEF058231610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24b94823b406c23faee6e52e515c476a804f87a3081daf28aeb3fdf86baa636. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEF058231611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e31c5beb22c51b608dce716684d49d2f51eacc6a3ac1d3fb9f3a75b4df1f668. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEF058231612.
Bläservereinigung der Wiener Philharmoniker
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21407500236b56ef968618ff9a029352ebe531949871476ee63b28ce02a7ac69. 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/DEF058231613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a947048f57604bcf77a5b72459632490eb14a4eff25b38060deb090435aeba. 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/DEF058231614.