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 0xb9be5f4a3d53c0de1dcf4ea5f0aa4885bc50b414bd12889597d668b58d7ed336. 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/509d5027-7578-4e2c-8198-6b8d1b87eead.json and https://artists.proofprofile.net/proofs/artist/509d5027-7578-4e2c-8198-6b8d1b87eead.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 0xb1ebb2257a55fd2c9c719295bdcec4e5bb0be62ff41f74f8ba78850d05b40804. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLE320800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713fd2595cac926312d1e17c273f9537ebe7b2bd48b3cc8d67038001d8c46662. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/NLE320800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc07ff03ac2c23c19c0131aedc58038090beccdbb62f070a10e628bfd1a0253. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/NLE320800042.
Huilen Is Voor Jou Te Laat / Adio Adio Adio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb09b99c0bbbc378190fae8633a245676ca814a58bee64c4d235aca945871cd. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NLE320800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cc6c159ae34c50160cb1a69206c8126f705df0b18d9c7f2f9a5f792a136e37. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLE320800041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11fa6ab92556017ee106435d5e8c1efa74333caf38dbebfc877365dbf8356ee. 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/NLE320300089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b96020dd77a71efbe1f02fc540bf3dd70d9b2deec5e1e32e2dcbe59fb593cd5. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/NLE320700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92702a32d44fc4fb7c7a1d216c6aa30f7dcb7950b7b2abfcb29bbc55600b7abf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLE320800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9106d45a901cc08ed9673c97240603dd0ee26f8af9dc6bc9d9ec225bb19d917b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLE320800071.
Ik Vraag Niet Veel Aan Jou / Na Regen Komt Altijd Zonneschijn
Adieu Cherie, Auf Wiedersehen / Regendruppels
Breng Mij Nog Eenmaal Naar Huis / In M'n Dromen
Tranen Heb Ik Om Jou Vaak Gehuild / Een Mooie Dag
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7f2eade88a0283779cebbd26969cb08bd04bd7ef6fefbb62db66134e7f77f0. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLRZ82000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8d465b560abe2fe9c514509428f2592ae14a8a71150fbfcd80daa536915064. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLE320800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23ba665b24712226858ccf0cb3f19fe38a9be8e7f13f2cf827fffd86566dcb2. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:02:48Z), 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/NLE320500089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e960f069b8fe99069e446f5c309dcfc5c4d4766a80f050c4d8c105f3764522. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLE320800045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1326ca28fd7fca4c7f9fa02ef83283401dce45422b1449ef7f867d1d0bc6b7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLE320800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ebb2257a55fd2c9c719295bdcec4e5bb0be62ff41f74f8ba78850d05b40804. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLE320800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d22ad19ecf28cb51d35f157c1524dd924428beeb8db16b41ad634ac18d106d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLE320800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8326463d11bb91bb8c3e7749dfc75dfdad9f49deee67eed3fd48049593b51013. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/NLE320800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb908278f8a7b66f629eeaa308511f206e468b084631ce05d6a49928cb7e3adca. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/NLE320800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2464c98b8a668663f64ab7f49e968c31a5f3ee814edf48dd0bb60e054666573. 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/NLE320800013.