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 0x8575c6ca51ea1f69610beb47dd194b1a6886bf53b042cf399a47429c48a5f6c5. 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/af404100-bef5-4c0f-a6e6-8826489c3e57.json and https://artists.proofprofile.net/proofs/artist/af404100-bef5-4c0f-a6e6-8826489c3e57.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 0x36695c6327876070e92fc56be2fb4f4a7c75172219fdb24ce99f0a3a62faeaf3. 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/ES09S1800316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fe3d8ccd6fef8f391f52eb9322b2d474dd3c38bb16298a2a454d48a48c8937. 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/ES09S1800317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe40f3bc190e9172dbcab1781c6ffb32590a75d604f7ccb68d3d89844f2d825f. 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/ES09S1800318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a1eb940e857587c0a754c7662bd301ced4b15b08ae4b1eae95e8509e162a3e. 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/ES09S1800319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fd4b3678ea185f138ae05dc5e0043d53cac1602e790496bdd1be5252d9ba19. 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/ES09S1800320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f47c041471959938dca048665a6acc9fd99492c3b6ff2de8dbfa4e6c2680eb7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES09S1800321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebd6aaa684c10230786f65e13b4e885ccc344cef69408fe632e489da3ed4916. 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/ES09S1800322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5e6f35a724fd4fe869660da8f122e50a01dd745e9b3a172fbe8b5e1d12cb2a. 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/ES09S1800324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdc18c6b260578dfc838f754885af2697a83aacd32b3d122d4a6c59a101fb2e. 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/ES09S1800323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12418df208c655633515472c69b14352777f1ed02b91bc640f307ae7356300eb. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/ES09S1900193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57e15b7db046ea3c67762dd828f6c41513bd9e117e53b99dc3fa8d74a33a98e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CH6541979350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85036670e657f582d9e4db60f6b0d16124935152b54a6e871d911e9b395275c. 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/CH6542068479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1693e92cc5c3bc9f057555b5586f58dcb0fee68b17e1ed022519e63870b4cc1. 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/CH6541979351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a158dc61f656eaf2196a89b435d0acc43817074c8ba7e3e2af1cecdeb3c15ef. 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/ES71G2305505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aba9a2c807734aa99127036a127abafbc24fba426e653ba4950a748a5a91556. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/ES71G2316266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5258b3b31d13e03d0cd0dcf199811c42c50f9b950bfdc3b0ea0c8145dd0318c9. 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/ES71G2329525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c0374ca078c6ff2f95fc57343fd0c14ae9bbc1c3572369f2332c823602df01. 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/ES71G2329526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa124f8c821f31374b8dc4bdbb71f8aba32c1ece516448e10ece7121163f4c438. 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/ES71G2329527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8dd53031042ed33dd05945b637994c30bb8a2dcfc3b7476fb588c34c3916e6. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QMFMF2528559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b1cb1fd955b59bf5c4a572793f4e67a6d9b0eb6014aaafd70dcd92a3d3d080. 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/QMFMF2528560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ddcf6a145ae216d9488744532537602bfdf2623e4698ff6612d3b2df6f1e52e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QMFMF2528561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3c9c9681736f29100321d3f6d040d29c7a31449089d2272b594cf1053ce8c0. 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/QMFMF2528566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528857b4596b0e991561587c62171cb4902b278c100d0ac6e2d68e0dcfed5805. 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/ES64E2459611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f7964714382f069d24b014a6fda357a72d148ba4f9850373aae9906e77fd3c. 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/CH6542044760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458f59d590f89427be60fc8628f1b3323dc3d814e780bccf266fe56c10ab42ae. 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/ES5232012216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405aec542b50b09acd80bb450d27f5e3c15bc93f4d21c871b7a8a6f4e639de9a. 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/USL4Q2110964.