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 0xaab578964ddb24c0a04b49c723bd7b026b3ca679f27dc460c029203d5ccc6d0d. 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/6b0b8f14-ded3-4cf3-beb9-a967af13593e.json and https://artists.proofprofile.net/proofs/artist/6b0b8f14-ded3-4cf3-beb9-a967af13593e.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 0x6b3652d1ec605f994e0684cbe657c4a836e0e31794ec6ac14266dd0a8a1e4f01. 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/VNA2L2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e6c62004f4d887b02a42affe69ca876152d0e80079e3ec85cd20753fb2a0bf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/VNA2L2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b06f79c6d87098e5d82cf5f16e0454d9fe7aa97eb1e924268ecf7c36d462478. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE57V2360127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d9058a871715e32fa0ba65dd0b8dd6aafa29e3fb6a6d2f460e9c9cacb627b3. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/SE57V2360128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e78e8eba627b2c35c8d76653db732ba05d6fe95d1e0b7fe7f72b55737851b1. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SE57V2360129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4dc4283a56fc9c316bfabba079de1b5aef6882118b513f87f64bed1b766b902. Chain 2 (Bitcoin): anchored in block 957246 (2026-07-09T01:49:50Z), 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/VNA2L2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe4e4f6295b1e241734a882a8405a7d15e89d17bbd812bfe04addeddf41098e. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/VNA2L2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b76549f37e05982f657a87f6287a7b134084de802f484d17dee891fb67004f5. 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/FRX452335906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6e8735cf85e517b26241431bb37468392419080c3a2b2863d368a8e8d09f28. 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/FRX452331446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ea1cbaf58771015f9c15266d6731a1ed6fa01552e61d7e2940eafce1642468. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZAKB2308054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32665f090fadb0ba52d365978891f4cf7ce56b2dd2346ca833ef955e9a5732a. 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/QZAKB2305203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3839f870dbf0f5cac4ea9bde610ce83ecfcf4c49124a36850da66ffaf23392ba. 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/QZNW72222133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a9d5a0a61fe935a4d47389cb4fa29ef5ced9a2b193bb4ac721845ff939fee8. 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/QZNW72222134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322e83042fdfdc665067ba6b21bce1633bd45d196cf450f7bf477615f9ce394d. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZNW72222137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30b7cd9f7eaf05cc1d38c92262a8d84a4bf5256436759fce2c9c1a611a7fd93. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DGA072283271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b75d9cdc74027e2f2a8bf0e8d1a5469181c1e7aeb9b85348841eb9a3f650dc. 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/QZNW72289266.