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 0xd68718bc262cff76eeddd1776726baf7e69cdee1cd82bea76a647c42a9f4cb39. 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/77599d80-2fde-4a3d-82a8-6200e4c26452.json and https://artists.proofprofile.net/proofs/artist/77599d80-2fde-4a3d-82a8-6200e4c26452.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 0x06833b33dbf385d8af21239a6d5bcdff51a2d4e75f13cfd15d365d8aaff5e1fb. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/US7VG2009359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4239ee232d20f04cd6458c39e3e77f0de31c73d7fb004ab66e7be13f863bf608. 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/BX6DE2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eee2d43837ac478ade7ef287ddd192ca2258ef229157b74b94609218b52ea98. 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/QZNJY2349791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aadc58c523fdb072da4a2bfb03eec90e3b0f2f60e0eb2a930604e97e43a6f63. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZNJV2488917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4943727a5230047fdaae1e2ab8f7256881ad225d1460adcd9742d92c2952744c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZNJX2484103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaea4c6a1817da65ed399ca952cb278bf1901c7ef6d4bbf31f5f2b75293908da. 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/QZTPX2435248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282d0fe59e6ac870885a0f85f4c8e8bdebc23c97090e1c6d8dd2c0c3dec25af6. 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/QZMZ92547203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24da7a0f41a01f489f34bb2afe906985eae9d406cd04f56cfe7221ffd9ebb7cb. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZNJV2517383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd68d43c10e54607e5e0a814d3d23dc9a31017e7327435917ebe209cf4e55d51. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/BKCDW2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b54542ffb15d55d24518c407add57e36b8d38130617183e0404d89ab9e5234. 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/QZNJW2543220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3943cbed21c1bdc71156558fe300136b4e892caa3798d357da2dca919ba2e6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BX72R2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5814616c341d22ff38677d282a9e065469cddef28504f09ab351973a6a4a3c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZEQU2034271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216e001a948e3abbdb48ce727d1dd46ee97841d883d656001d4d3abe32ed8df8. 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/BKOUP2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb40ec3ab4687ff5eb0a3b551dffa9fd86d8383a900b7b03ca96ced73825360. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZTV32532457.