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 0x0e79ab38916f71d8799c58d155394229c6e84fb4f194e394a860b9f31e4326ae. 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/dce6cee2-4a27-4f9d-9a24-39a74151ebc4.json and https://artists.proofprofile.net/proofs/artist/dce6cee2-4a27-4f9d-9a24-39a74151ebc4.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 0x0b85bec5ac5da22ed6cbc33e86e8ffab910180e7fce71e1837feccd20e07d931. 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/QZTAS2153082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d623c5533928fb318858bff7a47f9f1b94f5f79fab8e952a664539b8157f8bc. 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/QZTAS2168113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4df16f3a450640a876ab45b05fe334d376228f159e5a3d6f15798ccc0b7e90e. 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/QZTAS2165990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b922ec0f3584351e06b17f11899d8247753df2593a6aa07d08c595613163c69. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTAS2188826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6363b372da1199b9b9099abf53d7a055146cd788e9efd1957d9334d6656009. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZTAS2178461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190055e8d813c3cef816adbbb497b3faeeb901b23ac4efdccc447ede69b3bfc3. 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/QZTAT2180815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe329d73dff2e8ec233117e4fe9e8a859ffec523e6bd3fc5e81ff9bc80099d366. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6H2279517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6c0b1406cfabd203b706c1031a7508c1b769870043a72e50fdc5252600a327. 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/QZNWU2264198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4314110db1fd5a252bf55dc5b7cf8f82a1153f34e7b10e998459c38051e1b07f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTB22221068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7bf24b9265796e2141a9ba0e868ae43640329a0b5a309e71390c8d5ae73844. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZFZ62395541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec5df7f21611e5b834778892a5debcc8fd2d2571284c7df4bf721c337a7457f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNWX2375075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae90dbca01ad3382b24f55762109a8ac54578b5704a6e0b1fb2f31e7d29d70a2. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNWX2374434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5c9a6c78a59cbba4cb0bc0e21bfce2b77beff30071cbb2d290672881a0f299. 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/QZK6F2372601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e4edb0d5c65130ae737c7a82972b76829e2229d68589715fef5de1bc0d60b3. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZK6F2372595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea24d28d00d7a2b84a0377f73830610f6cbdf119a2c80077a9100ebc4fe7f98. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6F2372599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1cabd7de2cd3a1f7818bfb5e770cb950b4f7a9ba21c491b209709a5242f0606. 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/QZK6F2372598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b389db42c7840f0fd00a958b56d70bbf8999a55f4f7daa633f08a5610f01006. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZK6F2372602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a2a3d6711f7a8ce5240b7bef4896f20c4b242dadbf1714d5f9ffcee9b8b53d. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZK6F2372596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc106df845b8acb3ecb98e6e9e16b9f0bc26ad3fbb670c8d2d1a473ceff975579. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZK6F2372606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dfaae61cc63c51c99804f50f4807c386e1ec5607bd1c4ee54d1c45ecd4c9e1. 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/QZK6F2372604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa650ddf4aab005cb8ca77fa29b9179d994a197f6f29d003dddffc4f8261a449f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6F2372605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40cb421bb82e57ae489e767de44744fdb808845cee172b4f3e8104970e59614. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6F2372603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d8fcf5363db6fff7c00c221c2c72559aa3ec9c8ffda86c672429e5700e8a4c. 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/QZK6F2372600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeeeaa2ff7709ad0e005c5af40716cb19752af5597a425037df6684b6e1889b0. 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/QZK6F2372597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882cdd7f4a357538f3fae4bcb00d07783eace111c029684502ee0e9783333f39. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZK6F2372607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b30eb43bd3d6b392ae17d4ae9c69285b951581dca9ae827d949df75f13296a. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZDA52441454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943e2fca7eaa095aa0fb59da95de46eb3d38b79309cae08e18fef2347e0cca17. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZNWZ2458128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85f76fa8fce34feeae54cc4133c4779b4d817613e96ff8f2bc470286b53eb96. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZRP42409364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb7e91f46b4d5b8664bd3919acdbdca7a0a1e3659a16cd353c292f7ce6e3e2d. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZRP42411989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885e52a2421da24f598c88364eda757efd0007489968b4fe3ade6dcc10ae7baf. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZRP52470706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e19d663575028675f65fda8a0e64b00158acdcbf72b6ea6840824cfe121ed25. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTAS2402746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b6c637abe80a29da885baea2d6a0df1f99467293849e402dd1ad6cd5a537ce. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTAS2437740.