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 0x93d7adef6f845086bae0b2207076cfb2121a9ff9cb1da35a8d9cae35f0114f05. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/59bc4886-641c-4110-aa65-598e1024a003.json and https://artists.proofprofile.net/proofs/artist/59bc4886-641c-4110-aa65-598e1024a003.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 0xe5d42ca97af8899b4c6bfc6701343bba0f6d8666463779d106651e39eec5d35c. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/NLSU32100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb77cb3670dc90d2983079854f0a12dd762b30e7910ee3edf0f139ec5d81f1d1. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NLSU32100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf381f512ac38324aecd549ceaba7597bf7ae075c5be709b5d07e7f9b7cce659. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NLSU32100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b5b63ef3a63141ce4db48cd311236c9cd620680f7d77022bacb25e3f8333c7. 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/NLSU32100032.
Diamonds in the sand (Eduoardo Delvino Remix)
Beste Zangers Seizoen 2021 (Aflevering 7 - Anneke Van Giersbergen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf86673d040f5653fae20f24d3f995de8cd1f434571bd1c008546393e8b977d. 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/NLSU32100043.
Beste Zangers Seizoen 2021 (Aflevering 2 - Bökkers)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb77cb3670dc90d2983079854f0a12dd762b30e7910ee3edf0f139ec5d81f1d1. 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/NLSU32100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4dd7d4d77b7b01d399433289f62cbda8431f4248530781fe3760599855e0e73. 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/NLSU32100049.
Beste Zangers Seizoen 2021 (Aflevering 8 - Duetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4dd7d4d77b7b01d399433289f62cbda8431f4248530781fe3760599855e0e73. 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/NLSU32100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a40b84d3c89f29c6fe8c3f23672bd9dc0d90e76073dd4b5584954c6dbf3d613. 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/NLSU32100055.
Beste Zangers Seizoen 2021 (Aflevering 6 - Joe Buck)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7263eec2d05e0df52360f2d74f0e6146468d032a6f89ff582089dafbcfa23e53. 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/NLSU32100037.
Beste Zangers Seizoen 2021 (Aflevering 1 - VanVelzen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d42ca97af8899b4c6bfc6701343bba0f6d8666463779d106651e39eec5d35c. 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/NLSU32100012.
Beste Zangers Seizoen 2021 (Aflevering 3 - Belle Perez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf381f512ac38324aecd549ceaba7597bf7ae075c5be709b5d07e7f9b7cce659. 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/NLSU32100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b5b63ef3a63141ce4db48cd311236c9cd620680f7d77022bacb25e3f8333c7. 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/NLSU32100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7263eec2d05e0df52360f2d74f0e6146468d032a6f89ff582089dafbcfa23e53. 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/NLSU32100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609f650d25556fa010b9c41e836f02ed1e78531ba89e08f354ab6704d28db782. 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/NLRZ82500050.