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 0x1509b5c00c9ab2452e0357319bb3a1f821419ba477eedcc5d5e8b7f6cf098b8c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6baff328-d717-4467-9b39-2a28366b41b3.json and https://artists.proofprofile.net/proofs/artist/6baff328-d717-4467-9b39-2a28366b41b3.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 0x263348d5c8e3ad8b9a30cf3464dd059d5c9c7a100be7aa09e75a8825f05836a4. 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/QZPLS2316243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa396cef6c9dae922c878e0ccd40bb59b8c992033e9d82ffbb40959ca26121b6b. 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/QZPLS2316246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7de0b0fee0a5f1272b09133463118d6bb6b76894472c0a03933d0238193ebf2. 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/QZPLS2316249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6091f7b2a6fa55ac32a1b002cb857275994491e35cec5271a73ac2f85a283a. 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/QZPLS2316250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb635582a3ad2f58912c93d0138dcc381242f2cb0d56c979b30ce0ec5ae3e1b. 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/QZES82448051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f0faab96518dec1c1983e275be28a070c06c10359ec0c60147c511ce2a3abb. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/QZES82448053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84508762799e157bd00c5a3dc5c4dfa6425093005882987e1b8a4948496a66ec. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZES82448054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0207b1486f2bcc88c900d62e3d551e11552a35d80de83e4617ef23fa3f00adb. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZES82448055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d00c40502d7d40ca5d844c2baf2380779b28c72d27b6a9c46f01cd39831aac3. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZES82448056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17cd6263a5b089401400d93c8c8fbb5ee1718511043696ee654a87416b616545. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZFYX2431853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafce710ae022c93fcfe701242db64658f2afcfd9a0a7eb2c4a39d8645f3d36c9. 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/QZMEQ2378104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d76fd4a650bfff15ba642b8a147b6a923fa1fd466c415df0dd440e3de4b925. 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/QZMEQ2378105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7f81daad83bfa8cefa28f488d0adafbfaec0036989f7cb734dd4f005c2ef81. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZMEQ2378106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2780d9e06cd43c6dc2a3a3ceea8199a8adc076e3ed9ba6f135935a5b1dab1eb. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZDA42346821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4abdcd8ece795815f44fb7573e9c83347fc0295a1b9ffdc284dcf45a38dde34. 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/QZNWU2220794.