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 0xb775df33be6c5e0519bed47aea938e52a0eede346e0af0c8947a35e3ae711b9c. 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/f3a30e98-4cae-445b-a5e9-f92d80615db0.json and https://artists.proofprofile.net/proofs/artist/f3a30e98-4cae-445b-a5e9-f92d80615db0.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 0xb8db9cb30ae6a0f305201c17a7c27dbc2c4e3cd7d36a22377cd07296b7e22f92. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/PHV031010070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d60cdf871d1a272a0c394cdc1021660dcb38f9d24d3b957dd7870172e142cc. 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/PHV031010071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d2b59a442e3b9e84829cd52c5b43d0ee94c6a14ce8110177c0a1b64bd2dc85. 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/PHV031010072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451b1467adb2e549b9390cbac0790903d8d65a52e3c2495c62dd9d9b67bda406. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/PHV031010073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4b12eb448155996786242c447f868bac6392def953699b750208b6bc567093. 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/PHV031010076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727697cc301de213e07e610a2b3f47dbc645c5231197e5bfd8e3b9ee94b24e9a. 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/USDY41929383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b8f8718f3d1edc0d951ea3f3cd1fe75bdafbef9281703947f99016c05d9832. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USDY41929385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a4ce06faecabcac11134ef3b4e778dae5aad9021784368272a6651e93baa0f. 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/USDY41932759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbd1fa740fa2acef72add75e1729ee945369a23915e59cbb2bd399d70b140cb. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USDY41932761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7ba529a11811213b13c804f8f8d2ad1883de09382abf3260c0c0187b86113b. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USDY41932762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebfedc2d788f636494210a944445aa2b183e0359cfeaeaef2d767e4fc5c5e964. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USDY41932765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0b2518b92b2c5edfbb349552ff3779fedc34c8626f4ea8c13a470d2033ea39. 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/USDY41932766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc71da53523a64bb1e6af665be677fbc67d04a7925f77c63f8c8a6971c539166. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/USDY41932767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97d91bf11946a39a956153f9bd86e67113827b2a0d944e63ba580e31af514c0. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USDY41932769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e4bcfc5caf864ca58a1ec60521683580534b7654ab706505f20444ee1d57fb. 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/USX9P2371656.