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 0xb58e070e8bdc6374f1d962fc27c671196345ae8e3a69cf002afaa2bbe5591f1e. 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/50044728-e20b-4f0f-9ba5-3c8914133675.json and https://artists.proofprofile.net/proofs/artist/50044728-e20b-4f0f-9ba5-3c8914133675.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 0x8349795f87db447448135b7b6507579a2e4fc30a2df9369dfdfdf8060532a851. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZK6F2127966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb9c4e5d33b4a7723e0199314386d06e069be906d09cd82fc6823d828e7a58e. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QZNWU2134458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb869767778efec1e0accea958470c1d8c70fa5cd6d6d6292f6156b1c24f77e8. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZHN92268926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde267cff04a6a4620706a30a4f9f1d6bc6ccebd3120346931494979cff11641b. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZMHK2275042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c794912c9a5699c622775662618d38e8119349e27c27f7d008891590ad065b4. 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/QM8DG2494588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42165175d87b8ac504a60d162e9c526d86ef482bdb2f76af5aaf04b2a136444e. 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/QZFP52473921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34e723804a30a55f141b1c34f6e2bf566bb1a455e5ea581018c7918edc464b0. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZS662403816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eaf94b68dae920f44ca297b2ffad1c604d63bcdcc4512f1d9fc3f3e9188799f. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZH5E2481145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cab2d0f0dee4a3c9f1f8725f3241036ece10e328c57cc5e5fba50a8c878d954. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZZ8A2575645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dda300739e5f2ccffd8cc514258098b8409e33a035749b265b0c5986cde5e5e. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZVK62400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277ab5c2757c76e1a6432930882b6735ce4f2de980955ebe762a49d2ca9f46fb. 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/QZMHN2302731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4148c07b15a0b71ad31364ce15732ed42ebbe73bfa779a3ba99c477e60c599bc. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZVK62200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde267cff04a6a4620706a30a4f9f1d6bc6ccebd3120346931494979cff11641b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZMHK2275042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b37c55410a432c803eb5e790b103a55a5d1592e6c95f8c2af0c7817725c7222. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZMHK2350630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef63afaa1a5fe916db6aaa3b4f7010f032d989d7ccd9204b46d60aeba183f8c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZN882205192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad67af64ca2f37f3abe733a0d2baea048ffb895f3af95e39347272ab95b6954. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZS642572079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461bc796c088615766ea4b3dde5b5a292c8f059c48e287d259d904b500516cf6. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZMHN2409291.