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 0xd66df8e85073c1a14c50f85068814806e4be958de74945b350088c6a2e3ef614. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e71ec95-b58d-4f27-b5b7-155a5b745135.json and https://artists.proofprofile.net/proofs/artist/0e71ec95-b58d-4f27-b5b7-155a5b745135.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 0x6b9fdb83278cff39b37db1c3af8022ccd094f8473e9878221b9f4ecb373cda17. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZF8N2168975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b2f116c0e16d2b4db1d7a26cefd3506c57e4edcd4f445e57d113b1399952ea. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZMWW2284286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ee4eeb19ea450aff862c33211614bb8533fb5d72e782d163dc7f4c8cca2603. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNMW2316396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8872490fd957fd85766f5e0cd0eb38b164825f3d55fa3325ed233e683f4a4c88. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZWFQ2308525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e820bf8480b82b51f8f0890ef7644f5814721ec70eb0a8125e46482d4e5340. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZNMY2316327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7a0190df87b537db96c453933ef73a0f0e6fab89e1649d49a0f74c1a496242. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZFZ72478715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896e606dfcfa358879a4457edda4e269af546a5b09998a3c0eb031b9840ca37f. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZK6L2428521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5c28344267e88203e8a77366e61f3985af17d3f49d8b8c9084fe427d94e882. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZNWR2433870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e39705be7cff03bb40c6d4066a6a9da5ba4d5b98e0a3baea773d36198e389b. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZNMT2428973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd51e4d28136160a9fa19dd360b93f17a6d2d3099ef35fa6458cd94e9ec530f. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZNMT2428432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123ceff20c3a1169e6d1a76683cae23afd42c68734d44ab61682484fd1dad6df. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZNMU2450596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b90947788d2607b8b84040878642b2b5d352d1e78c4c5c8211d8c1cba4e91f. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/QZWFJ2442861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029397353f4777ec29dade0252d6721d48666e7ff849dcecd60c0b256693cc6d. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZES52549945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06148bd7fa1da1aae2d55888e6c900db8cfa7015ec629e94a734571a0e06a1c9. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZK6G2532661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f6a02fec26e4bda9941ded24a20c5cd2c28881ed867f7dd0197892b4f415c0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6G2532663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285ce2382ee217898e5016b15d732061b7e753fcd901929a903632fcb9ee8ff8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6G2532665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f1a9a176d79a1292361345aa7328d17f87c56da8267496a0d36842c1278dc2. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QT5WH2575757.