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 0x41798316ea4b052d6872d1164631bfe6c5b026058848f606ca6f01dc6ab5087b. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f933892f-8d3f-43f9-b4a5-edce5b259b33.json and https://artists.proofprofile.net/proofs/artist/f933892f-8d3f-43f9-b4a5-edce5b259b33.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 0x58b9fd0324a3b17512cd3186f0efa1bbf6f6066ca178b9d0d950813707987f98. 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/FRX991529129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85ef60eb52ab9d76c4416b145f3f4f4c628170145a41b0f7a8ca7e2428ca6e0. 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/FRX991529130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53845f2279108f748daa79f08878ad47c57967db7f95967ed645a8caebd1bd08. 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/FRX991529131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be6717c17d8edc81ac3859a00a2fd99f0ad18e51f93c8b3977485195a54d0cb. 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/FRX991529133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918ed99ad8486b5729dfc56ac429557750915fbb92c5d870559eb3cafc70c921. 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/FRX991529134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2730110fddbff91024f79d031666a66d92cfda696fad8852333183dd7694e067. 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/FRX991529135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2c97d59b098eceb4a6ea8ca46a4197d1cebc8eed4ab3aa105a6600f10f4b04. 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/FRX991529136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc079af46a99d9589af2fae45255e889e83e3b97b678f3403b6acf9094eb6d5ee. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/FRX991529137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349aa479829de854f3d15e2604a7e39894e20eb03edd4aa3776623c3808e7969. 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/FRX991529138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad3c2152c60ee9e2085a84688bbcb73fbfa979e6055f12ee31cb88f41655066. 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/FRX991529139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b2bef1d8d3169226ce6ffb528b6eef29773311822c42cd2fb1d85fa541ab40. 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/FRX991529140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac14222d6c7b903a283390480ad36dd9ceb566e97bdf243d0ef7b6e4cd18f50b. 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/FRX991529142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2d466eb3abbff354f986b18a88a95ddc6efc0c98382484c510dddc7638e059. 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/FRX991529143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64d030d6e82eab22bb3028d2b3fe7b7d9fb2e1d3c52eb431fd4a493ace786a90. 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/USDHM2102021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b5c20e9ba731afda31d84c5d325a7fa1b03a1c5daa7f520e03ec2d2cd2bb4d. 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/QMHUY1453624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337d342875606e831513cdf50a70fd71f204f514c1265accbfcdfdb17f68e6f1. 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/QMHUY1453627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781b975e5597601c3d677138c26589b2c4d1b0db6090eb71e8f60ae764b4672a. 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/QMHUY1453631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9531392d5e7e8d75e0664dd3d8c032a92c044d6e19126b8a026357d4e71bbba. 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/QMHUY1451781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0624cd71d751468c897169718a0df849aadbf45d8848e8a08522a574e89b4ea5. 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/QMHUY1451769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2db5b7531330a82e0a218b6c285b38492933d348f41f8baf9121ac2c1a005b. 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/QMHUY1451782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3e6d6dbb5ecd278c55eab250cabc1176668fc2c23bb449ef422477f483689f. 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/QMHUY1451773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517865447dfaed9f01bd707e155eb97b2722a6fd42805f852e09cc23417d52e6. 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/QMHUY1451777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7372f619b9195d26205c729c8bc362944d4092093524daa59a11c9f8e08ffb4. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QMHUY1451780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd274c7d4bb67c9e1e867b0b820e4d9d2d44e27b46266f0cea0d1138662d6e04a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZDQH2006633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153458227c605629c953a35f0de5f45a12723f09d41907970bf4f4edc624dc68. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZDQH2006637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6238cb76b2df210158b68a0ad7ad501e01248e35c9ad52255dfad5bfbb323c54. 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/QZDQH2006638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13e4e79c1129cca995f82715ed4c4ef10072a115a23da8c5bd2ed4f8947d423. 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/QZDQH2006641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddcfd7228f9623c95e4fda46f3957f1aba3040ce541aa19521591042be8b062. 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/QZDQH2006643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704d11d675e7cde8527c6db637813cb667b5fc4d7bf867490dc728da994f7387. 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/USJTQ0904315.