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 0x3fe21cd4ba7bad446180963281d00ed5aa7966f4e49d75e84d160ae6fbf14020. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9463168-1dab-4603-bc56-10f6ca238ca5.json and https://artists.proofprofile.net/proofs/artist/b9463168-1dab-4603-bc56-10f6ca238ca5.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 0xb71aa9796697399e29854a7b9b607e0f8dd77f951260a0d0faf8c61adcaaa388. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZES82426467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a49df038ed96064a5e7a452eb1e3abc5b2b0348c54f80f3307bb0bc6713701. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZES82426468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda27882f2b4f4bbee50c6ad69c53ae80f727d462211169121881f4e1fe94df3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES82426469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a64cecb89dfae96796d34db45992de00287f3130e9168a6545ec5738b4b5a21. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES82426470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf91f862ad7610d27b7f48ea7ef54404e14f05e14b81fde7eb847684b384785c. 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/QZES82426471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaede0b54c68ef6fe520c2a4230481281911c813b1ce706f5c5736e336ef6aa76. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZES82426472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2ae79f514ed7f3f1009beea2f70dca39f0ab0725c569728d33dbc8cfbd2dd3. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QZES82426473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939875c335697369d502a8c1f17ad645d5899ceecd37164a33a532a584d6df71. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZES82426474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d544ef16dcc5e0c36d9e426c6071df790209acb618fc9b2c833df62919a5b98. 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/QZES82426475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec7b4403385f34268d13c8306cdae939da30d70758bb49de50e82c19538414e. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZES82426476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80591cb4ba60ee444d82596f9a7ef54cfc6315c96785628cba5e36b4cd2d185. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZES82426477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c792883827d813a595942d976a61bc91be9167c4b82807b49afc1af539fe7f. 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/QZES82426478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cbd8e2abf1456e26e0aa0ac78325b18913f180f8f573b1e8ebb3bf88436fb1. 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/QZES82426479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac8be6f7be46d42c098b1b8ae84e7ba90df40ba4dddc69a0cbed9245158e876. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN42439663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc015c2f9889a0a8c34e0eab77bfe6ada79dee730db57272e1c237d5ee297381. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZK6H2424524.