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 0x8e1c9cf00e8d1532d2f1f84109af4303b41df5c6cbf02982743adaf54bef6caf. 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/991dd775-d9cd-4ffd-8d51-954a6ce4ec3e.json and https://artists.proofprofile.net/proofs/artist/991dd775-d9cd-4ffd-8d51-954a6ce4ec3e.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 0x801371b63720d14ee4f194119d88895bb0b82dbe6c21cf5e927cb4ca9ae632a7. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZFZ32080749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11dea032a532d74183be1aef854910cd628104c4b68a7773c26121abb9b53a1b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZFZ71918409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7234ddc28afd03e43e946789fa2ebf4baa94c853701678b942b5431f5b52759. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZTBB2259862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9324f0707060607d2b5531e50f503af7aba886a844a5c9c09601c0f2dca36557. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZES92261847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996acd33e568e954ac12894628cfe0c455c82707610894d1472d9bb31ffa8a08. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZTBB2259871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ef73bf7b156b341baf28455a60262e42bf1f32982a4ed5c7fdc3b5d3a0e7a7. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6M2418060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe716bdc526f18f11f18cd26d613f7ba82a1d5fa35b45c7f7b3752e571af53ed2. 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/QZZ7W2465376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91790e64564487b9ceebae97b720fa5951e0b8c09e45fe8fc773e8186c960233. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZZ7W2465378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082c1b1f0a532841160c089d35d3cddbbdb16ab8db6d30dbbaed4c35baea0c58. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZZ7W2465381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab11beee6b6df7f94cbc8158745674c4253badea961368b3cf0670e6dcee985c. 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/QZK6P2210340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1070aa0c7ef615c56bde56f1b786ea625526a5b96ddbd7318585b89c101450. 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/QZK6Q2380835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe229280d75f437693763ae96550d3cfbc39735d00e0c33616e181e46cfdbca4e. 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/QZNWT2263392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1070aa0c7ef615c56bde56f1b786ea625526a5b96ddbd7318585b89c101450. 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/QZK6Q2380835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f7da167391f8e7e3548883ad6eaacce04201b7ed4cc6be51a25755a5a32444. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/FR9W12241897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f7da167391f8e7e3548883ad6eaacce04201b7ed4cc6be51a25755a5a32444. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FR9W12241897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741be01d674a7ccc6230d9c42da8902be432436f016abaef1d05d47b38d98239. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZNWV2285520.