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 0x95671d2c4ac8b024caf7932f9d7c8aff1ab68010c9be0e811d00805a1ccee303. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d1a490f-ee8c-4e57-9e38-53c6070bb814.json and https://artists.proofprofile.net/proofs/artist/9d1a490f-ee8c-4e57-9e38-53c6070bb814.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 0x143ef3c124d15ab82793a45f5a49071c27c2bce8b17655bfdf3fc52f3c022d3a. 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/QZDA51964189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd17fa3221930f2749c7e448349c9828d78d100d8bce8529d726007f9614bda. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCAEE1998109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e88206ac3aefd7b125826ee66279edf02840312be786e8081591842bfd85a2. 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/TCAEE1998113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000378cce49a9b18bf2d4f7ba77823b8b176f69c425e57a556e4813d25df7b7e. 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/QZDA41917344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85951483f9cc8ffffada2527d8a95b4c3e613fa891b83d01cac8fc144e1d4432. 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/TCAEE1998138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de25af770db324a809c7873d3569d0bf04695c09aa10d6422a7a1ea55880d2c. 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/TCADB1766844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76dcc7a0d25baf59fc86ad15c3f6f71a778adbb7a8cad51a13577e721592013d. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/TCADB1766849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0d0eec46fca715e6f029b1ba47b9b3c198e48b6eaab523ca190579d917a9d9. 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/TCACJ1557605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf441b28d7f10e9b3394f2f55080da9da8470e30608ffdb2dd106e7cc05ec9c28. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TCACJ1557673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5cd1391113c8a881a2915cd2d81ba4b91adf9469c62c717d8dffe803919ed0. 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/QZCE61810745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002ba42e04584126990a3e23dbc3bd9f277163ea9d019fc13b38aaf28f1652a2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZCE61810746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda5e9c6f3f88ffc030100dc65d3151aff7ad25d06b78240cd33069ec1fae4c2. 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/QZCE61810747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08818c8382f03f82b8d54a071e4d9e8b3b9fb60e9dc902ed2439173b6f2381f6. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZCE61810748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe41e3825549c77af99b69b758cec2785dcd849adacf5d9f33f134b5e2ad53a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZCE61810749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd883a4081718543fb51823f435d0aa58bb0d9f9baedd8146d76849d04857c095. 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/QZCE61810750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b7e1ec08173ca550415244879dddbac52608dd15426c1a98e1f7f2d813fbc7. 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/QZCE61810859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e844e92b1e2320cb6d1e4ecc6a9c34af51826177d94097c933456c0da8f9d85. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZCE61810860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2031b29c4ab41c2499bea8d969198526cf03ad08a36019d4ba8324ec97ab8641. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZCE61810861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5255a7d29014492b1f1b6ed761276e30ab631959d97d33e1a2f11bcbb6ff0ed9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZCE61810862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52f655f91fc83a4bfb7c3ae0f40686ba645a726f97edb93e675564bd123ebf5. 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/QZCE61810863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253bbabb8f2d9952649f5c24c4f39da77dde9c15d68f45aa2c5c50f39dded40f. 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/QZCE61810864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0845d9431cf13093a148626476315f1c21bca0432472d15411b0a776252a4b7. 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/QZCE61810865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6b849b75d65a8dc9c0f999dc0d5df9503eef689ecfd65b83c9481284144c6f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZCE61810867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec33b0e53f2ca8e1b1a996ced755f3e9893adeeb7baafef3f978fd575bfed9aa. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/TCACD1503594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bff7a546e8031debcd3a820e53c36142a2c083087545585eeb32e05d7ae9c4. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCACD1503597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1424094ce2dfcf6bd0135163d7fee3f34b179dac45936e42de6daea5e3beb1db. 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/TCACD1503600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec103f2ff0f69eda2b5b5ade84a13297e157835af24d90e4dfe6b6715c80c9f5. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCACD1503601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec0b65b625a6ec58875923818fa4d39713baba6204496d1fbc2331f0d1dea3a. 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/TCACD1503604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ac63279964e0ee14dadb9b2806d3aff912db49a257a8ab2c473f1f4e2a3b74. 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/TCACD1503608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9ec8c591d694f424c3eeb1614ca31d0ae4a1cacaeace49917e5c64a2158b1c. 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/TCABM1336356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374d4f7601edb16247b4df22a84e41917f4b2a299ab2ebcc9faa24c12bf1a496. 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/TCABM1336363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07db0097e23a747726e115848f970458016011f89ca8f8737b7d5122d5ad1453. 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/TCABM1336437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1381088322db6b1875e0dcbbb606fb951d0ea1c43851ece2a4117dd3739e660. 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/TCABM1336447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f153c561ca8dd8548181081b099f2e4af9482321a900c60e70716faf4ef703. 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/TCABM1336483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c96c4ca1ac7f268e497f922c7888c39e04480ac93461492debc02470ca7d05. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCABM1336498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61eec3f85f61b907ebe43422c7f4818881c7c6b5ab4f03819a770b552882fed4. 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/TCABM1336532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfda98bde4edb286f88c42514f00f1d9d409106d36a2194131b2c13bbfc6844. 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/TCABM1336557.