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 0x5c96a44236003c5db848628105044035a5a136741374c851098599272cc86f05. 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/87df784a-7177-404d-9b08-9629cbf45148.json and https://artists.proofprofile.net/proofs/artist/87df784a-7177-404d-9b08-9629cbf45148.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 0x74695fbfaa84bcf0e41c2ea0a9d9de6a341151900e4aaad7cd95d775388f476b. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZTAY2240606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc43e4e5057eda6338be172dab527f0b3681ed771e351ce8f3246883885e0f8. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZFYY2363476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27687dfbd4e4e480f8c3d051e4b57b1d737287e6da6547fd7568f7399d6b9b51. 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/QZFYY2363478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c9ea4e98336fab841478be0df26c07b1615928f648bdfaa497e9b4df57c1fa. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZFYY2363479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95552d3b5653f63326fd6d149150fd1d93938ad4ef41226e8d7175d4b1ffcfcd. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZFYY2363485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae213230f2e244065d59664622cec43cea8228a2c8d07d4e287f1b7b9fdcb56. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNWY2309268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c70a467c0be031a09b53c0296211fa15ec6d6bc2a4a3747ea7be4dd86a1445. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/QZNWY2309270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f8ddda7b15ec6cd0986adae0857dc93da1da8c891c7fb78ed419041ae11458. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZK6G2487633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914ccee95cbeb2d1cd0250782dddf44233d81f075a4e3260ed7679baf8f2b356. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZRP42486559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf177b839ad41d929c6d29f729b94e345b26fd3bfd3863df2960d5794dd49d7f5. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZTB52411461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a9b4a39bea3983f6aa561dd5af4289db6c15d94af991c1be361654e8dff619. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7S2417587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5459045a70af5bd7dfde90edd4b482e5b10daacbd7d7abaa6581b51aacae6e4. Chain 2 (Bitcoin): anchored in block 957629 (2026-07-11T23:44:46Z), 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/QZZ7S2417589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf422f1d234630c6142b07043bedf7fcd9d7e476c9896678e0012f28e1edaf587. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/QZZ7S2417591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37574d8454662c7d9ece8e455d7fdc0534db2c7cd47a4d876b74d9b471eb73ed. Chain 2 (Bitcoin): anchored in block 957681 (2026-07-12T09:09:02Z), 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/QZDA52518734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf17e6f42434311dd04608dac29a48d9fec3f9cba99cf452fb7102c2dd483b79. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZK6K2588850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604f70f6a1ae903df12150d0ea5107d776377794c90eab6c442b3181f43aea33. 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/QZK6K2588851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfa32361a7c37e2c50fc3c7e9fded7916dda4911162db63f65e1a85e2ce3e41. 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/QZK6K2588852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ce162f507d8dfbda1956161660db274903dda7bcc87a62ccaa7edd813fddce. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZK6K2588853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce3a0a23cfedca1c7be20354096fa38e11cb08c87c9c67bd126ffa30781fd9f. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZK6K2588854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05fa9ba65cef0a8c913ea3f365b54becac996a4b678e0c2e81a054357b4b2edd. Chain 2 (Bitcoin): anchored in block 956777 (2026-07-05T11:01:08Z), 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/QZK6K2588856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31feb0c194aed05de25866a50e2fb004706d18d07d316dd7910d06fae2727ef1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6K2588857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1526782fc6a69b15a47d36a106b4c0174d7b366c6cdd22e0c764daa924701f. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZK6K2588858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970fecd0ce8454b694803c7e21331c389314218d99a19b407c80aec7cabf4cc7. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZK6K2588859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989a072c39673bae83bc4226564aeddf3626f23c3148816ff2587516cafa5f0e. 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/QZMER2560062.