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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf837fe50a8bc46e3899e6688ba8580e74116398043d934ae3bb091f724586c71. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80471fc4-d3ff-4c6d-8c9a-5b5d6536e8b8.json and https://artists.proofprofile.net/proofs/artist/80471fc4-d3ff-4c6d-8c9a-5b5d6536e8b8.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12b48b8de9d56b3fa1729e4c168588c01404168c205de0b7a6ebcbd59fc87fc. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZFZ62259007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ab9981fd37fee5da273c75d93c8dba31533bdb009adf215e96fbfb0210c95f. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZK6J2214184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a42f5a8ca64e979fe6eea172526cc02f6eacbd95afd0b4ab118b5258d72fcc9. 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/QZFYX2323071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bda4bb7bfa40491ba4a5d110d2014a3b4bfd16e4ecde34bdf603bbffd3a47e4. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZES92372285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb694fa99271987efc28422166749ced23df32cc1a7ba3606dc2e89024126c24f. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:22:12Z), 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/QZTBD2316486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fade33b5cfaf07a9127e25bcbaa188f0aeb5ebf42673fec7a3bf9ed1a39f1ab. 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/QZWFN2380473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a48266722b8358d3183b148641d08e969c12bf4477e23db60aeddb6ddb7495. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:31:37Z), 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/QZHNC2421054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf702962141c1d4f51fdcab7f8ee5f389a8570ef449fef828da1cda01e4d9dd08. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZK6N2451795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7976606c77d8bd435f23119de2b0999137f1d64f289441b70d54a32118f13659. 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/QZWFT2492324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a07decc39a73b06c37f71c770481d6af025518df12573e8a98c0189b40d4a37. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZZ772410430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213afe80b2b2808153d728728f2ef1902e0a37a7c9a95e0e75f14d0405a909f9. 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/QZZ772410431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61c7564146f579a066bb98597e2d3cc4476a00d92cf2a7b7e053a0a7aeda44a. 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/QZZ772410432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13eeda0731c1fff49c8cf08fd130d4bcee9bdb718c0368212030720e9ec07ac. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZZ772410433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7674d31e2c66e450f7c049104f3c7088b2fd89bbc52215c5f69dca9f516f2cc. 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/QZFZ22557500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd025a63ae6b1769d70079f79e413ee15d388968e67983ef88cd86b1bcf9f58a6. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T10:56:57Z), 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/QZTB82542724.