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 0xfb75877e9afb072d370347b9c6b3a5110c59f39b8a669de0f7177726ad3507a8. 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/6c9e3d41-4bad-41b3-a77d-613be293ac9f.json and https://artists.proofprofile.net/proofs/artist/6c9e3d41-4bad-41b3-a77d-613be293ac9f.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 0x2acd214d180f082720eebb7f43e0fcf340df14d0a24a708767ff40a8a239819a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLT2H2100978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4c986a43082be62b16052b5e19f6aa20b9d06dca062e9ea3bb4c6a7f75c079. 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/NLT2H2200119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac93be13e159da4a89c175b6c33991de5fd7b0b5b864ec47a4a674c30b66c530. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLT2H2200175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e828e386985671ac5ee665b8d61ddad8260d5766e3eddc015cb4407374bd9c. 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/FXQ892200297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa77b5d8cce968878e0db96d838a48c2b37b929a0d7425324c712f29311d7119. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/FXQ892200298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec89735ddbe79d11825d2e69f37e04dccb84fa8896a01f6621a50ed7abae4488. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/FXQ892200300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3259da26a9aa314de64940ab70b4a57ba7cf3fda425b17bd64fcf0b55c71d3. 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/FXQ892200301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f2e9a12397238e5d0c90fca2768b02ecee0d85adb19b49db4c4b1eb2d1de8f. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/NLT2H2400866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f2e9a12397238e5d0c90fca2768b02ecee0d85adb19b49db4c4b1eb2d1de8f. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/NLT2H2400866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646f49dbb1d8992a4e2e15303b38d385071953004bdf9f2ab5dbca309ee3f896. 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/USANG2471647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96f515ec25cc0a2e3fedf9288929ddbbb8031942a49433e6e3e5ab7425331ba. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/US3DF2542084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8624d3a6b0e9224f9eadfae05c5c90a4080a73ddadfdb0247582f49d990a25c2. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/US3DF2542088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab35cec51d0469b60dbba57f6be7a6b2453dec3dc420297a243d7d13684d4fd0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FXQ892200442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47c9b392f32462b8d98f5775578a7079f4d321ef5a69b1d6b6cf0e09efb57ec. 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/FXQ892200444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae837cc73b1471e32d0a320ec0c4145d0f646f61b026ea32cf1f88b49d44012. 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/DEYT72300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d203928c9d9c6fb3d65ab49297327d96e7ed35fc15cfd2c8766c9733c7e826. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FXQ892400113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3fe75f2e5449e6dce16090495e9a593f093f4e55d0424648db81e0022a6015. 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/FXQ892300117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2e01c70acf41dc82a2697c5e6ef74f3ae1acbdde53ddbfef2e52b1d19d0fb4. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/FXQ892200346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe4fed130c5b107c0f7a4593b6e98f553a888058f16d40c6ca4e515d3777760. 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/FXQ892200351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b4a08c3dc1970e25ae8bac84d99443d3536e0068f30fb8cbff562bd7b2c70a. 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/US3DF2536822.