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 0xe90f7dc1f908f3e8765dd824cec31437c4207646227325fe450033389abfbebd. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d32a2af9-5f08-4335-a5a4-652f6c6a6735.json and https://artists.proofprofile.net/proofs/artist/d32a2af9-5f08-4335-a5a4-652f6c6a6735.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xac36e7bf02574d18c691b5824b4f65d03959830509a95a77a9700e97c0395d96. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NLG620591007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d43ce5b2ad61bf2ff60ed41200778860b719332e33bd8479b24170722ef8af. 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/NLG620591008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532792cdb207c74ba93a0c5f6fc9968c7ee480efcea682d9d6f7cabd0c7829e2. 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/NLG620591010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ee7207fd16aaed07ff281cee3d4242a70b286e41e368c9c0956f23bbd4ab18. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NLG620591014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051564bb75342a41f5eb52ab87310951710ef530873bd84b8e7381161b8eabaa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLL6R1601423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43081c28128c8c757b5b7e880de24b0b5cd03b5519268b31008f12abe837f3d. 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/NLL6R1601426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab5d093a5bad52739f4cc55cf6fa9465aebf23c461bdfd544472a3676d1415f. 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/NLL6R1601431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54db0d49f9cadb3263ee317f8651cde185fac4e2686ed61eb2ae9cdb034a519. 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/NLL6R1601425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018dbc8b60a4c1f9bfc3ea0db5b798aecc61ebcc5cc18d989a8663c184a641cb. 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/NLL6R1601427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6790219956bf433fed7b954d715efa3582ecd2fe1ed728da0cf208e38e767887. 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/NLL6R1601434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811ad0813f64cee538a11ebee45672e82d1bce86527a5d8ad35a4422bcd0f866. 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/NLL6R1601429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b51ba98dc720bf178dc87fa16639f63114afdc2eb9e65e2b4e6a355e062276. 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/NLL6R1601432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41c0189463411d49036bb9641752a13c2420dd316b49c786a4bea558c8eff74. 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/NLL6R1601436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6eb1a518363d6d5520329147835aa6695fb9273875d77b1c52d723e7b736612. 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/NLL6R1601438.
Geliefde Liederen uit het verzoek programma "Wens"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625afef130b9d1ddd0241dcae902834d0fe9d5fa7a2be72ec3552eb5218fe914. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QMBZ91613050.
Christelijk Gemengd Koor De Lofstem Emst
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eaf0a9c52e217ac4539c28eda0ebd362240d174a6dbf4f1a239c544c130ba5e. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/NLG620616472.
Uit de diepte roep ik U - Naar Psalm 130
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bf2647665944dc5a4f69d1a56abf672b9b061f6b9a78919feaf66b67323d14. 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/NLG620616480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c61d29791d221c119dbb85fac462cc3c24c4dad76421ce882d44ce0824b730. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QMBZ91613052.