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 0x358233e9eebda606af541ce416494ec4ea4e19546f64275d361035d49937b892. 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/a9f86b3a-48cd-43f3-9c29-428d5fb6660c.json and https://artists.proofprofile.net/proofs/artist/a9f86b3a-48cd-43f3-9c29-428d5fb6660c.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 0x205f31771f40065a9ae3937823f72feaabbe9d20d9bb9f55593f715012bf24eb. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/MXUM71903491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f358f7207e65145232fe187e4201ba7f227e41963cf29f95056525335caff2. 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/MXUM71903830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fc58592b278cd944e67e8ebb0b7c6f24e5c10084ff5813649bb877dce5545f. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/MXUM72004690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a4aa56f4990e060aa9d217781c4466b1774e9a003362de58846f9475edef29. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXUM72005633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536c86e91803cb90a57ec0acc9f04983ae9570b63bf795ce6a755cfbd0a1c08a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/MXUM72006411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe697972e249f99049078f5466729779c2838cc665b86cd622e1c592ae78fd7b2. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/MXUM72006866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641a9e4c4ec31116e7f8b5b6e38d504bfba02a5b4e05d1d7389975c8a2fa06df. 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/MXUM72007392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb1c5af24be0286ad2c95571397e770046aa6f05afd08400089ffcf21bb9ce4. 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/MXUM72008377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fc58592b278cd944e67e8ebb0b7c6f24e5c10084ff5813649bb877dce5545f. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/MXUM72004690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641a9e4c4ec31116e7f8b5b6e38d504bfba02a5b4e05d1d7389975c8a2fa06df. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/MXUM72007392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a4aa56f4990e060aa9d217781c4466b1774e9a003362de58846f9475edef29. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/MXUM72005633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1864559a5ff4b0f66a2ae9b2ea0c5535eec692e0b9e08703efbe45bae26dcb. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/MXUM72008825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb1c5af24be0286ad2c95571397e770046aa6f05afd08400089ffcf21bb9ce4. 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/MXUM72008377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d71a1e71395b0a4ec6034e79967629a38fda4144610e05795fbd44abf2b6969. 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/MXUM72200203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261812f7f2351799edad785769e981373c70f77e9c5349f2dcd9b905d6023317. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/MXUM72200205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6151907424623ef29616e7537ba4035097be85c6a5da7fd5e33fca235788696c. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/MXUM72200206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ee1142fb5be678d9aecad5aeaec988af06b5941982d514748ef46d867a630b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXUM72200207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbd700bf9b852c629c5dc53b864c106580052f6fe69a6c94a1c1b90e0ede5b0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/MXUM72200209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4d961d514b92034536116a581927029b70dc32fe45a8f2128983eaffc63bb7. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/MXUM72200211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae551b227cc6357196d58c25e780fa17bc4656e5efcb9625c698b39a7a82ebad. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/MXUM72200212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee1609e6044dd08e543375972b2aec11eb30560e41d7d9e91638080453dc3d2. Chain 2 (Bitcoin): anchored in block 957629 (2026-07-11T23:44:46Z), 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/MXUM72200213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5c0b856bc38c5950a42c2e02f0f986936611a8962bcc89c25b37c20a130a68. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/MXUM72200214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8896c01ea8afe3e3f9c6e370ab482011564a1f390e6ba3a66fb35bb742b124b0. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/MXUM72403263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3a8794c60b28fd7ee6f19766e864a6948c012b958872577e2cd905d552de68. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXUM72403266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a29464fe5af1f429dab3a5bf204cfed3b98a853787e1c05033a177cc9b4119. 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/MXUM72403268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef3847a16bbf2d50035d2a3e9ebe98199f1b5d4f35be4ce3ecc9495e4adaabf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXUM72403270.