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 0x952635ee5376383b867e7b983a8f07a7767411ad0641ee256109d99091945473. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aec75889-2c5b-452a-9b51-a62ece478cf2.json and https://artists.proofprofile.net/proofs/artist/aec75889-2c5b-452a-9b51-a62ece478cf2.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 0xf7b9c5454299dc5bd62623e98c3e786e0b314038920eaf886affb42837e028e7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFZ62398346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a68f82c58987c5a8f6da4648d5ffddb764ce799919e03826bd9a5110d771ae7. 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/QZRP42221339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246ee176e4a1d018108a7a64d4057ea7b1afb14a4d8dde59acf360ea55d2a76b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTB72386091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c45b2ab1b346b3f1e1511afaa716c3ed0c46806327ba1965a5de8a4db05389a. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZTB72386092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6808c124b91089323502bbbf3d2faeb984963e91fdfd4fab0a8f3ac3178e7e3. 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/QZES92306687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfedeb261594cfc0a15fb0e3a97b3cfcb3c9456d65db7e489adb42f027cfd07. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZTAT2359186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729f1ee75a1aa5e06b07d5af8a01db250c106b5cc302f7b8c1b4933edd036d87. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6K2073335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d06f4c448d10920c8a7ed11d91ac5d3b048a6b832ba2fdfda3cb53da3dbd11. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZK6K2073336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce9e8d4ff1e1da3d810c575919810875e129bc83d06351b5aec0ec181eababc. 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/QZK6K2073337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10944e35e1d292e909ce9e1cf7e8db220a19678eaf32cb78ecf46bec7d7689b. 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/QZK6K2073341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6633cd5c61c008548c4f4a90c2a8092ce0ef6be610b8a45d96e40ad2153df5df. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZK6K2073348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90358ebb80cdb6adbdd766b932d435bd57e27ecc891e1aac62ed1f495342218a. 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/QZK6K2073349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a6051ab14e0e007710aa87be9c435695e1dd2f1a8cdbcd15463fa83bf25fa0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6K2073350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa497a5da395d1a5f84e603e2b4661015a126c38e0c8b4e12fefce9ca3853a8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6K2073351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f10255d82f0629644f88a58341fcc3afcd757d4dc3305cd220aaeac61c3b4ae. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZ4JJ1759347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44f49d3c8390e1c631658636b933ff84f316d7c3dbd7f95b994b65659fb878e. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZ4JJ1759349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc049dd34714d26e5fb43f24363f1d93e7ac4d82e9e3ff541522983b1e154a491. 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/QZ4JJ1759350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ffdc146341422bccceaf5c79849a77c8976cf5fc8872d7e53d8600256b457e. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZ4JJ1759355.