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 0x0acc11a3d796db3995ee2672556c6bde431e0c0ae1d57a738d8001238050e52c. 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/4b806646-c831-4952-a423-93bfe37276cc.json and https://artists.proofprofile.net/proofs/artist/4b806646-c831-4952-a423-93bfe37276cc.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 0x22f557a4ef8e5364c2390e1854a1122936dee712a9d8201756ff4943bc964a06. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/USANG2200418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0bd882742157207da5236b55e409883b2082de899b7ca6e3fdc78c67a7d93c. 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/QM3DF2191006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde440296f995d94d6f0d6960c8258a7f34438c5d80642b6c9f8613a68f51483f. 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/QM3DF2191007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855325238edcb9aa722c30b8ebee3ad7965692d4cd7f1479c05c62bc14d19f71. 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/QM3DF2191008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d64875ccd00d2818b8b31643d2bf9082ca0a2759efb1662890eaf66cb1fc342. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QM3DF2191009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705c159d4eadfb4c6fe16b53fdd2ffd23acf269fd84935663ab430735d201690. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QM3DF2191011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fea3930aa29dad6a2dc9a13bf727a8ddda6be294bc2617115d5c36bee39d3a. 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/QM3DF2191013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08510fc7c2e3397c832a456323ee848441ecf7e71dcd552385f91fe547f3ff5d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USANG2169193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78d46cbb8e0ca6d1657a8150a12e5f1a230b7f9abbcf600365e5b3dda319ae8. 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/USANG2169198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9251017a3ee901cea01c71d5ee944fcc6389f3c145dc602219fd4be55f03f2da. 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/USANG2169202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25aeaa446677e71941239b64e88d76eefbbafcadb39a70b9fcd904bb64cec5b7. 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/USANG2169206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd275a69404e0b72955577b000627c6f98e52f3c741820e9ed97ff8a3c0ed6f. 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/USANG2169209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36199441421b8821018ac69ad262c19ec0b3babf8107cd3489ae5635e787d44. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USANG2169210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e93cff593ceba5c2890322f8dfc4d1590456a83f15cef1a226a8591b584106. 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/USANG2169213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba22bea626cf03b5c22acc4debcd49c16844a944871982ee58fccac1a21f0dc. 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/USANG2169214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecd68931a04665dc85f7afaf925873ddecd33ca073bc3188a42bfff98b7cfb0. 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/USANG2169218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf38e1b713b0fe539e1c452b4abbc24c24f4d17a13819bc7d0b9b08215e6e16. 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/QM3DF2290096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3686cc289839122f7a9a537c74172e38c7f89227cb79a79ca71e5b213650a03a. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZ9QQ2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9e79a623089b1cc48f8da86ae307b45e886438f4cc2ad868105ca559b001f2. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US3DF2258606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a1624087cdbe734703dab1fc3921fbdf63d3a7f1f6770c5d5035ebf6cf42eb. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/US3DF2244570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd3069883a1cce90348f822525842c209b263447462373b3a669d0d49394bfb. 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/US3DF2239674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d45802c09d6a5150f75985166514053c47d7dba2fca20e8b2095e9f4b9da1b. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/US3DF2210164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdfc9808139907c3612657b7f8baebdbde4bec50c26a18cf6270d7369a8b49e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USDXS2105138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0704cec2735f6648bbc43076e7801023263e54d7cbaffde4c9e05a7cc70e2b. 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/QM3DF2129501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a2277819a1e2141280dd29f87931f50f7d35486f3738ee92504941aa03f8b7c. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US3DF2136145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d76debf78ac32643f8ae138e3a376ff3b57d2bf3c3776bec8add77c799f129. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USANG2198932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37ee6a52df4616c51e9cb2b583010326752cd26ad01a21756499c63e1deab90. 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/USANG2156094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f42e3f944af8c68dd5f2b2109d3ff6b3b89155d6dafbaa687d8bbf0d3fdda8. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/USANG2128061.