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 0xe6b965b8169e27731ad565112eaf299968cb671a23bf6225f0a32a5257485cfb. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf5ebb59-7d1b-4563-bd65-3cf02d444ef2.json and https://artists.proofprofile.net/proofs/artist/cf5ebb59-7d1b-4563-bd65-3cf02d444ef2.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 0xe806e389d5464b5827372afed455c8f9290f8f06360e91bfe31c65ebb366632b. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZTAZ2379266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a893c4ed9d6bc00e2989044d85f797c19076e6b56f7f7ece1259345c8087230. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZWFM2312235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a79fc7dc6b5f4762aa62c64cea5ea12e42d8b44cf12b5a9aa81830428acd469. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZWFM2312236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda57f02b20416dc4dda81ad441799e4254091395088b839d2b81b6fa96134a23. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZWFM2312237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b88f78f24c673a44b6c80712256988b4ec0cfac4f7350c0ada4ec723843152. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFM2312238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf657fc302cc6db081f53d8c795439cc22ff031fef274e8057531e0d5f76449f4. 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/QZFYY2411667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb89f0595152f4068c4f533b6a8d5af54df01b136e2116a7240914c806fde4b. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZTAY2430029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2154bf820a3c792a166da2d5007a75a21047cc6f86d8c3d75d4b7416ba5955. 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/QZTAX2419425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a36e41fc99f2377188ba9501d0d055b50990ec3f8f4781630e7d8809976d89e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZDA42521405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31b9b9301687e786b2502d97d9907bbdb272836481ac4ffb8c85f2ce6bd6611. 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/QZDA42521406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bcb963fd27d12d77a1c90fea4fc233393d5a20831b9a59ee5af60554c3d458. 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/QZDA42521407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75359aa56b6113b922988ba89946686ae450df29e143ddf97281a225bd69aa2b. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZDA42521408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d8732f0277501ef7dddaed857932e414f7c376752f520ce93f367e28ff8f55. 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/QZMEN2508049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15f4534a2f74125b7ad96d3e81c1a5d2490aa6e41725d8dc81d6cbaaad7d862. 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/QZMEN2508050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4c7fcab34c924165fca4f72559301029d317723638b0de66ebd275c814712a. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZMEN2508051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac17f215466f029edfbfd7e224299611fe10f3da5f205b4b5e89669d67d4fca. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZMEN2508052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab301ce62124e40bcfc8261b4b229bfd66c891b5826d2f8b3653d388b02cb65. 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/QZMEN2508053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849da13ca2debedade9c7e57dd882435ad0fa77257035bd26619340a03be531d. 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/QZMEN2508055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3737310c7e090c299b395972732641cff745c543be8008d6e704ed585b08f499. 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/QZMEN2508056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317ca5382304c8b96aa4fa580dd24fd807859b2501aae1c6668cd6964ba72321. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZMEN2508057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32f618ff0e8137b0c2d0a57a6dc31df98923cc35575f3e3aa80d0e8b5329828. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/QZMEN2508058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe68816a59487088ba7b8c1c2b38e4f3d585e5eb38300994bb6fc59c29ca24d8. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZMEN2508059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf805d52ef43bb2757d55d4b9af4ce9f653232587cca015e3cf10a41a8cd383cb. 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/QZMEN2508060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84c4dfa3b282d9eeacb8422a7fd50c1c0eab43cf327f7b9505836fe5453a10b. 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/QZMEN2508061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9519fc89ec67a88d94312480bd8d002d2910f4063b15278cc1cc9fd6eac3a68a. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZMEN2508062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb485b21599c09e9d303eeb8e3c7d3115ed2dcbb4e183edfad6cd47ed01ebba7. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QZMEN2508063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0e818598a30007d472f0bc1d493837e8a51a8ea897a6db1dc587f60fba4dcd. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZMEN2508064.