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 0x3e3bc668be5dc6d48c643b7ea84ff14cadb17fcff0714283e05d81272eb982a1. 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/f8330763-30eb-4599-8b93-a518ae5024db.json and https://artists.proofprofile.net/proofs/artist/f8330763-30eb-4599-8b93-a518ae5024db.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 0x3a0e7bd16dcca72e0df4bbd4823d02d08dd3b1a5da7bb74d6ac284c4fcd5ccaa. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZNWT2105741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58464894938172904c17353d8136519525eab9ff95b11a3e8c367b89e1fb157a. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZNWT2105742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f509e2fe1124e2363ed43826f38824348b84efcfeeb613c51521c8ad805c29. 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/QZNWT2105743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0da42704dd2cfc28f7a0f272858f9799c0d47261a8d60d52110f8b6c29371c. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZNWT2105744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6b893fded2a52b58cf224a590eb6ae13f80cc2a5a219bf5a71517e25fc26c7. 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/QZNWT2105745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c15974d8d4197d46263c1ada16b2167b77f2d84d785944902904d41b711da2. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZNWT2105746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df4a5844a14dada40cfcf3a3a422d3c7c417913fc44fe9c9e394fcb4b051dcb. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZNWT2105747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0dc4f98187391cffe86f157c5d010f59056b6e334b2eca5850826303ec55111. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZNWT2105748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11217a8567405176f221723d5c7cdf64f1b16af2700d900a6d6dcfc39f6deda3. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZNWT2105749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdb3456127ccb76f281f08708bdad18c549a78a88077bd4ec2fbd57ca5e691a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWT2105750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b957cf8b840423c85e4a21b8a4696c1008850b4f7ef6b33d2307f31e6c8ab0a. 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/QZNWT2105751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe100d810538612689056fcbc6788ec34dee163e35ba90f16bd328df741eaa13. 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/QZNWT2105752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee100d7727aeb0f30b1aa8be617928fbaf1aa9548b87a98fee6b17cf0edbbf0e. 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/QZNWT2105753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5a9d1af1769be4e0fd06ac7e96e4edd1e2a76a5678390f27c1263e0e92b58a. 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/QZNWT2105754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c8ac9530e6491f1f261e7a7a3be93843aa0d2e0a273355ac4b9637b34291fe. 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/QZNWT2105755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aad721193c9c3c63a83266ecbb90e9035f2e1b7a079a5b3f31f091caf7e266a. 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/QZNWT2105756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e63b5decd103f9d768577aa49f032228d06ed44280accb42b518b3807e41c8. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNWT2105757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d13421e5c93fb4356a4026dd1ceb86b429c2e4d6f414552becc99d2458bc670. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZNWT2105758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f486c1f9d40ecf13576c0c770c90ed024a107bf4039fb4db576fb400fbdf89. 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/QZNWT2105759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef52b518883c2c4186341c0c59d20b2a1fe0bd73b854fc997b29068c4d3b468a. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZNWT2105760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307d62b2e4da86be4fa60b7cbb21d2120c9c0f4337be03d8e87db391e2c6a2ed. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZNWT2105761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e22514b761024beea5c33e1e4ff78add2e1aa7271688106cc4f3d3e786b6e6f. 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/QZNWT2105762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023801a8982a4429d8b3a42e2f24783d4567f0f150fe38b78e2f4a2923f8d7fb. 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/QZNWT2105763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf109b3f780d3d3af4512771c35f7fb32fac3574304718e5e3b789495802017. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNWT2105764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec6df8b7a30d1abc7ac5e9f38a945a31bbaed87c86e63b0f366d32af8228d77. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZNWT2105765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd2a3aa7d6ca968458a7f69ac6c030e789d7c4972789286dacbb619bcca5236. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/USANG2212251.