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 0x932efd30e16191a7f4645c2ffd7afa6f2c05dda2675dfd6991b8002b18ba095a. 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/dda59096-db89-4e88-a497-5232eb484b00.json and https://artists.proofprofile.net/proofs/artist/dda59096-db89-4e88-a497-5232eb484b00.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 0x1c7654eca173dd4efd19d6526f9a44e987e790e7eb5eeb5908ac8b895181e9ef. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZHN61916918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d05ecb33cb61c14af5b0cbab3de1bbd9e08bcc14dabbd892ce82a99a205ef1d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN61916919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc464c81c4952284b9ac7ca7255445cbc37d678a55a1665154692b8b9b55b289. 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/QZHN61916926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee295917dac0883d066f16674fa0f2805562c3d3ca1251bf7dfc200c3d251d5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6N1955889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0010f0725df6b88fa628743b895cb51b260d5f002d4097e57d2af2c1cdce2672. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6N1955890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4bf365526a839b563b3e0461795f800cb4918fe5929e895c162c7388eae278. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6N1955891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa327aee9ba1c544d16eed515d8ddd5c240adf50a47995d527ac5afe3e8ba8e22. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6N1955892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1d9516a98ab90ec151337f34eb6207b82a879959fc248262f2ece43ee93bd4. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZK6N1955893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfceb9eba6a9296d661c0af57bb9318030ba7b56f95e8d76d1b64b9e06a57436. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6N1955894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0189a5cc602c7c9f47794ca2fc5e29e02236739239a5fff50b9d3ba2473414. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFYZ2064479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a1317040bcef55663270d6a4d36d24c68e1fc450d61a281d82c27ab512543a. 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/QZFYZ2064488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b86c2ee57d001ad673e9e81d4edc4eee7f79e21780d3c8999d29573d48d2e2. 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/QZHNA2041183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8579532dd6cc72b94d60490ae262a3bf4e2d7143f106b5e6049a052a2747a4. 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/QZFZ72108111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ed0f7b9e1dd6a115191094642d096375c6d6f54b168987546d7abdbf41d687. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZFYX2521209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fe567edd136d1aa7eaab6555ad67ae4f539205a8c42c6d0f90db86af7a6b41. 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/QZFYX2521216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7747dcc664cd2b614a2b61afed4ac7fa2ad95847f3b9576b60efcf61f0de70ea. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USHM22543314.