thumb|Stubnblues (MQ 2007) thumb|"Dr. Kurt Ostbahn, singer in retreat". Marionette by Karin Schäfer. Wilhelm Resetarits (21 December 1948 – 24 April 2022),Willi Resetarits tödlich verunglückt better
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 0xba26327ed42edf53f1467503a3ca8cba7ed30cfc368c6339eeb0f82c6d1da6fb. 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/f124092e-ac0c-48a1-a476-71e038f362a4.json and https://artists.proofprofile.net/proofs/artist/f124092e-ac0c-48a1-a476-71e038f362a4.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 0xe12cefe8e4c98afa93e18a1540cbaccb0981f1dadc8bc7c2eb035ec106c30fa4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ATSA41800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647c2f72593bb1db4026632709c859c1b27bd1c1d9085c24204ef0b129b8495c. 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/ATSA41800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f3b9d8ef3677aa7e5b0641385fc82f96588aa45cf131dacb070eeea55aa8f0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ATSA41800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e047029ea19c10edc19a15a5f73265bce7269d74d6657d8d653bd76bcb63b40. 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/ATSA41800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbdca570ffa744a35525c9bf6f3a776e5085346768fd38ef432866056c06efa7. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ATSA41800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3789114ef50e09f4986fa1daa369c96371d4fb7689ad79653825cc6a546151b. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ATSA41800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca45b5d9e9758f371fcbdbe2d983aa3f8a057efc762013630717532e17973328. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ATSA41800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c746e42265ba721e8403f63e46176efab3eb32c60d2f947d1686d0f89ecc53. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ATSA41800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7f1a00c58604965c1c2725db9a7b6397374d58da9b051d803ea6a1329a364a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ATSA41800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6f28bac826ae2fb5a3b02b9d6bedde03aed6bafe9f88ee873ee80eb63be714. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ATSA41800029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e1bfa3a9b1959e1591005ed0ae2a5c86f2cce0155d6fc5e60252f4ece49054. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ATGH42100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba219a4ee9b6e5199b06440773ce02b5cbf5c16cfbd822dd5c87129db443fe1. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ATUM70801081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b090430fcac5dd36102237eba8331d60518b1d7c95cbd482683453ac828539. 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/ATB131900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50497e80a1873d2072f56714942d0e989d6f86a7c069591fde3197f47c80e011. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ATB131400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b57da8e35ba439d35920f112da3a1600c8b87c5aff78af5eced6695ab7f341. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ATB131400034.