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 0x49fce52f11a236e4af0b126c3e89a1a6293aec07efa382d435215eee5bfdb6cd. 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/c1ddee85-81f3-4bef-8f39-6709ec85e792.json and https://artists.proofprofile.net/proofs/artist/c1ddee85-81f3-4bef-8f39-6709ec85e792.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 0xb7bcfe562a233eedb6a2eddd225152a2c96655ebacc8fd38eb8f33d7f05c1231. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLA349500247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7cf4ad68999a2050d98b7c3beddf22918c741bdb73f13b78810c2a7ca65df8. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NLA349600178.
Ik Heb 'n Hart Zo Groot Als 'n Klerenkast
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f02cf91f2e5ca699be70b1f04c177a8259560e1dc1f10b774a1fc009a1c082. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLA349500208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f05678e0c288ff649d24808dce2b3c5c7ba84a546128e635059e0302a82e22. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/NLAX70922559.
Als De Klokken Van Ons Kerkje Luiden Gaan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ce853b108d676af554c67967c7a2e2e648c439c630fa56dae5d20d524778d4. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/NLAX70922564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5c7bea772ba2ebd46c20c3c6122219807df68246f924f7e522b460b733958b. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/NLAX70922565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7efa6226be5b7a5df378fb86e6b2a69e6349ec74d710691e2537d84a3afb28. 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/NLAX70922566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcd42de8fa2225cbd88cf4add4d3779bbb4520343def5f35878038687c6b307. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/NLAX70928174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71fcc66849be18e6dcf7e351168f925b241836e47e24504ed399544cdf06de6. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/NLAX70928175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa1c26845e8713919c655b9d0b88b8bb15196f6e21dfd38f60f941a30ccbfc1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLAX70928185.
De Gouden Jaren van Telstar: De Four Tak
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7c9609f4b94734daaff0a7ed09af11c58b2895496f26eff45f07295dbf843f. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLA349500536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f02cf91f2e5ca699be70b1f04c177a8259560e1dc1f10b774a1fc009a1c082. 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/NLA349500208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7c9609f4b94734daaff0a7ed09af11c58b2895496f26eff45f07295dbf843f. 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/NLA349500536.
De Regenboog Serie: De Grootste Hits - De Vergeten Piraten Hits, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f02cf91f2e5ca699be70b1f04c177a8259560e1dc1f10b774a1fc009a1c082. 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/NLA349500208.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d21c6d7af5f956b2e376e71a96d10cb8326971dab1d74c684a9f1deb150b653. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLA349400398.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 14
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96126e3fd4a14958f9fa18b4bc0c73a0e287147c6042d032602232a07827e240. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLA349700170.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 11
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358501e1bf164429bb4decc7a4804a7db734761400342034a0e698884e1700c5. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/NLA349600254.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 24
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197ad8a75fe264aef0a0db1513b891b2eb817ef386a1cad6b7a9ae441e752fd6. 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/NLA340200147.