thumb|upright=1.2|Clockwise, from top left: Dutch ordinary, Nepalese diplomatic, Chinese service, and Polish ordinary passports A passport is a formal travel document issued by a government that cert
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 0x21320677ecfc03b27e07fcda4eb21ccd69a681f1986120e5cc28b03392ecf047. Chain 2 (Bitcoin): anchored in block 953706 (2026-06-14T23:14:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b5b96ec-5992-46b4-8d0b-a553fa29b996.json and https://artists.proofprofile.net/proofs/artist/7b5b96ec-5992-46b4-8d0b-a553fa29b996.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 0xa9b6dc178c35208f743b62300d2737c4a834899734270c6cbaee674c48405c2a. 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/DEA629551450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb19b4d4ea2f6300971bfd638057ef0f9e479392bf7776bf7cea1340f67fba7. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/DEA620001167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8daf922f89d4fada80c79a40ddbd22cd06605898961b7da7ea150bfb8e2d5852. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEA620001169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3090446344e21c85d6222d93b8e9a0c8280475e230f1f25b3d9c6d3879fd2378. 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/DEA629550930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13798b3c66eef07c2b28dc1d9fd44ffb59757b2af15512efd0ac83cdf8efbcc. 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/DEA620001172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073b70f00ddb4b47812aa72af5f578d11d595f8f1e90c9e44927026912ff01d7. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/DEA620001208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c489a64216b07e0cc5051af4676ba76b849ed83de419423413c408aa126f5b. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:56:32Z), 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/DEA629551030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899c46ff4dfebdc988febc980471854c51991dcb32b48c1d0c3a063755963789. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/DEA629551620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1238ab213912d4f0353719200a34bf82909cc1992f39c6acdb30e04511b76bb8. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:45:32Z), 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/DEA629551630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b42efa76269718991b5ecee94d3e290f14e1d240c699cee31c50588c9609a1. 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/DEA629551050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f27c12c58702c91d01e537cceb76ad577130421374680b229671b1ddb95660b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DEA620001179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f58343cd5be151582d6a3124d49a8e8c9e1288d811ece9bcbad89c872826db. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/DEA620001181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa933546ae30e1d025f2ae7316e5ce56204599266f6f1106b54f8eab72812fa16. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T23:14:09Z), 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/USAT20503277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed6f7d06a2eff2ea65692b465477e1d379844e890414e93c191712d788fe0e9. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/USAT20503278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9113c60557d7df3af9779871f7adc7daa5041beb6524d337cf18191bfc5c3ce7. 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/USAT20503279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c82e740be6ace611db00ba0acc4645eedc367c15a57a441787812b631d36cae. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:27:04Z), 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/USAT20503280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3841c3197e4583c90fcc58a12c2615620f26d5bc87299a8ba9dbde55b481e5. 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/USAT20503282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99079d7a0b60a9d330dbb6e15edae4f616972cb55ce1792a06918fb1210b86ca. 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/USAT20503284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6e0c8c86bc4170c3a118f2a64470e8142bb9c31b3e3322540039a6a1eb39f2. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/DEA629551200.