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 0x501bf7b97ae5914e4bfb52ec18f088b494d0e514f92e88dec4f1d6af9081d3f4. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49904be6-37fd-45be-bc17-af03a1ac062d.json and https://artists.proofprofile.net/proofs/artist/49904be6-37fd-45be-bc17-af03a1ac062d.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 0x3556d5a97bb247ef8fe91ebaeeb8aa8270107d2e3522af7fe38b6ef4070adbd3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTBB2438645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716a9921635d22aa58fc01d5b3fdda4c76cf4c43de8160e0080c1e835c769afd. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZTAX2427941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64a53277ce4a68d84c0b49d3e8b57cef2de5a4d05625f6094e9cceef447076a. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZNWT2490022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0fdd6fc4d7ac80e12f4bdf02a803e6107d62e05e5f378c90e7739b8c0b07c4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEP2332471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408520a1c99f21b877811dbcc9e9377eda5c966a7147fe4b727cbcc227b45b59. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN72025826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe477380793580a6715f4984282bfe28e8e8734025804a3a6832f4ddc0aca9bc0. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN72025827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f6c7a7550efe7e0a320456c958afcae22ac95fe6b473bf58e6d9b4654ba0f8. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDA42021533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a27750b91b6db590ad614f6b57744bbf8f0422361578d72fbbe962df0c994f8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZK6N1922055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707a4d9d0fc9eb688881bb4772a07e73ec45daadff58edb766d46181b7e3d8e9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZK6N1922056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef5c5102ab30bbfae7f530141165ea4e8eff68406ac9c8333420fec8f747478. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN81939541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276d9daa5777b07826b7d15f460c7b50521877b761661d85f4609b5fbe0afe73. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHN81939542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109edb854e4bddf5e953c531c8f770189e3e9beb52ce6a87625d3a16b1b41a8a. 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/QZHN81939543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdefcef90125f215b7b7bfc5e54e8854dbc6d9f8392f1cfd8580a29ec470dfc4. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZHN81939544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1b5b22427e7fe2f9886b9b6f6e6ff9d678cf7d4ab42a80158be57fa416b789. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZFZ41926483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33495f03652ee4aca263ceb84d291c1c7b9cd7d65a811fefa45503164f7cc7b2. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZFZ41926484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3486510ff6219c100001f219ba9a0f2598fb01caf1c733ce2547f4a5bafe7fc. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZFYY1922487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3522680f3dbf841ae3ccef264a1d92ff7c82becac940c3a9f37268eb52a097. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZFYY1922488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e79600466fa05fa7fa1d2485d794335b7336e5a477e733d8a84dba0ca7b76bc. 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/QZFYY1922489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0548f7f788e98597c9abe18a25e88bfa7eba29a0c23852fada34186893af1e. 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/QZFYY1922490.