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 0xba00d1eecf4e3fecdc264abe53c5c19467059a9496e7ae05176052e1e700273c. 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/a0ab1aaa-3e12-4ac5-af9d-5ef058972cc7.json and https://artists.proofprofile.net/proofs/artist/a0ab1aaa-3e12-4ac5-af9d-5ef058972cc7.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 0xf4120c0abd8c33a9516013e2f9d88bc36f7d6423c1540d237b8f11ee188ecd93. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/QZFZ71952446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c9545af77f0eaa6762815b10c9b1383b3f9d66e5ebfda9a67040d9f81f1018. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZFZ71952447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802b6458dc3b2ddf6e1ec446bd5a6d1537fb35769906473b6606c35a33d0b972. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZFZ71952448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b55562f806685cff48c0e852993381f274467c0e745a67d61503fc4be5b5ed. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZFZ71952450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda83ffe98bbe1dadcb1591523203bacf6dbaceeca3c4d4c94a35d755b7ea3fc5. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZFZ71952452.
Grün, grün, grün sind alle meine Kleider
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd246a7921e912353b856a1e2909874a323fd900d5a4e5b5e555ed9f9b22f341c. 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/QZFZ71952453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8c9a09560e7203739de52965087fbb5cf1ad1bbd84aba7452acbec8af02d87. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZFZ71952454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2ee899ebfe2ba496a0135b30521b8a0e4a745111e7d59a89e427618f3a88a3. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZFZ71952455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb084fa769bf6e83e15591e14ee3b5afa7ca860bec65f27799472c8caf77e80. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHN91988296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950290313740fe3d40d7c27611aca34cabcf7dcd4c9a2df511c1f9f00ca1e01a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZHN91988297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da974420902987b232bfcfea7296603d836fb80b528304136998f2086660e25. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN91988300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf80293f831b52e8d77d2f8f9d420ded62767131a0d85f161eaa934d532991e4. 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/QZHN91988304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32da9bac035fc452b694cc644398d353f45ac253af77ba0150517b6ee98b6c44. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZFZ72089276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc863467a9316f7b4162160ec31cbc4a5c72808a30c4253d636aad26abdcc545c. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZFZ72088957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3544505154b9d47c3972c92fb3401a4381562c2131ac3679e12abeee73a0f24b. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZHN72013101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aec3c8d91587959569aec7caf85134964c34bdf9a5617668be402bfc38bd51b. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/QZES82271106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0403082b036dabcaf51b1ef1a0dc87dee0dd67a2fa1244a708c9a685e6c78fa. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZES82271107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa585718de2b4777f42fe8d64b19d34f0032ce43290e1fc229cbf2486d5b5de. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZES82271111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd826e6eea93b1a234ed6807c04fd74e1d097d5c3602af9e904f0c90ddef90cd7. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZES82271112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf2532ce92d22303245997f460009f8b9e019b24d59ecd8e1703b7694c4839a. 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/QZK6J2377390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ac6b53b40c86ad8f17cbe1deafb8b2843c98c34074d3635b70108aa2fb5e46. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZTBB2439481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d84ff0a1d1fd91bd6d4a806fd0aec439c318a0a9326febe683b776cb33c0fd8. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTAY2529927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa37a660b7e862376a99b8334cc1dd5a0aee00be535390c97179025caf62136. 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/QZK6F2547403.