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 0x309dce0203b7912c22e11b8dec31bc1729a9afcc8429d01f85f9c9b489a7581d. 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/ec71f3f8-9299-422a-a341-8173bbe5d6e0.json and https://artists.proofprofile.net/proofs/artist/ec71f3f8-9299-422a-a341-8173bbe5d6e0.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 0xaf50dc75ae72d4a71db840e0ad9c068a9b9b1c12f35deee31104b7e3b3faeac6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZVEM1841490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcd80ced84a5ad70f987440a65291c3a598fd5737e9de0703d2eb22c35fa178. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZVEM1841491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25af801dbfa90f4e92b0826ab7998cca96f106e4bca5b55ccb1cb71d6896b9a9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZVEM1845162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbe78034faec4b7c9d4b02b693040e8043e7b1399cc8c6280ae32bccc6f8fd9. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZVEM1845163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b47276aa874c9bfbe4966d7aa22a5d8c2ee8c2db8155896ecab1a5db3e3805. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZVEM1845164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e530f2d5ec75444f08941382cf2bfd30c05a978ba8e3ef0141b69027b105b7f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZVEM1845165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb12dd45b3f5230d9ece19669c47c40b3cff06677a7ac8f8334000ab0d1f9e0. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZVEM1845166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd12747ba6b865f477a2da2960a83802a2cfdfb4720be0700fd1914d7672a09. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZVEM1845167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553300a1286868d3905c6fc9b44623471982a10e17da3942baeba80b07bf9105. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZVEM1845168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d2e3d1b8e479f9ca78ae3316ae13d3a1d7b2feb70b3ce6e559aab595703923. 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/QZVEM1845170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6cf98c019300ff201a084d9a1bf496043d1655ac78c9789db13779c86dbe16. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZVEM1845174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d47ab194e0440e0f163b871c020a73d7ee092f50f54696f220bd49a2fe87916. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZVEM1845176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c92f8645e77e535e0d756d416cde789b4a95f50edb7036b8f196184271b0431. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZVEM1863208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4240adf64f5ca7c686e85227914be8adf82809e2ef597664ad7cd3b88e05f0b. 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/QZVEM1863209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498e50bbfd30b0ed7d483714e8bb7378b3b1b1110b91d863d75dd37b48f2fc92. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZPEW2501540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2df1692ae03a6b1aa9e92f4ca04dab2b5604601bd217e8b39193ad0dab658ab. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZPEW2592980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dee92193409764c89ee9f4804e701bc308152cdc826c555654d601ade3705c7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZPEW2592983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44211727a256ba6ffa5b76bf7bab1bfd42216a952941ce8ecb6c295b0134a886. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/QZVEM2546952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57c3c91006ebe7dac4f8940a80a5a884c1c1c55d856cc3dcd8ccc29b46ed42e. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZVEM2546953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3876d896442c2122e4bc97247fa101d3badc81bc4d477e33b1aa4c1e07b53b3. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZVEM2546954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb509d3399f1b05a80d34e93aae6cb4348bb9b6851da1312fb5d5797b962204e. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZVEM2546955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fd45022ed68087e6c1cdb5ab53745dfc0c49d1514283af87cdde5ba34958df. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZVEM2546957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2728d8a25b396de1b47f29916998b19787a028b62527d2fd26c01227f9bb7256. 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/QT4K42564841.