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 0xd4c2e2704756438cfd901f66e44520f8349f99f500630e6b99c5db225d68b4d3. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ae23941f-a7dd-423f-9c8a-2b8aa94cb089.json and https://artists.proofprofile.net/proofs/artist/ae23941f-a7dd-423f-9c8a-2b8aa94cb089.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 0x88b5f7c829d0b5edc3ea5e454f6e4f24e7615d978d924f756a2f04f691127083. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZTAU2431012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bc5963bc8e963297138f23904ec4e9720575b1d838a8158f793fbb3ecc53ae. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZTAU2462513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe327e86205b3468ee8373b6dbb54d2840b4ff2e4fc178c43854dffeabcfd13cd. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTAU2462514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618914159fd2799a9e03a96c89be8bbe09acd10f780f7f32bac9b4d70b83f8c0. 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/QZTAU2462515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a1ad80f0ffa1b0b3df7ac391b26ac721b327c45b9835d144c582198b01e0b1. 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/QZTAU2482825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a32fb33f972494d602770dd20936431e878c84bf1e43c750e749650ed18595. 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/QZTAU2482826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca4c14e8f1c585433a344cc70f33d2649bbfe81c940ad1935a454c344787830. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZTAU2482827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa615a21a102fe2269489d15c500c732d7f85137da128f97dd7162134cdd52ee2. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZTAU2482828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa467cdc6b705e3f4fa9678ff193b1d9cced8bac4ee8c84b1ea3acdba742d302d. 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/QZTAU2482829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d635084a857b8af7ec6b2a6862b6a07413c541784e040eac834fcc18ee1d3db. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTAU2482830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee9af51ce3b4ff2ce139a288ae884280b064c642694e45aaecbb5134a89ed1f. 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/QZTAU2482831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d8402d1e24e58e444fb34bce92306d84a64b8567592e46a3f1d6e56a46fd41. 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/QZTAU2482832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d870338eacd7394c7dbebb78c5cd42ebbeecb81b806e032ff0657198fe2749. 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/QZTAU2482833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb22f516108f5940d5ec294f3b745af2e9eea87c3e1e8d01ab6536eb86ff1592. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZTBA2438749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a55bba3796fa1374df6182c417d228e92ad129e3e1b7de1dd0c874f8df2c28. 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/QZTBA2438750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ed5805cbfced4a79525243db98fe53afb0806198a48d30521324e13f9397bd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTBA2438751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d70427ff88b6f35a0346bc704328ab5fb759638f370e99868358c8fd774426. 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/QZTBA2438752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d33b3ce4216b5a30c47e6adf92bb72642a82b919f6a30a30238c5d7d3ac503c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTBA2438753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cb5c0546f37a33548e55e2f1e8a7bdcd2acbe1f9fda511bdd88fa1a182872e. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZTBA2438754.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b868b3cb0ec425b3b80229d5802f7fd579224b501dd602fc8d7ecd7a41e128. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZTBA2438756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd372f8732c7ec4b2ea99ac2bf6d2c97f424c7d234af53ef66d36023f045cb2ca. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZTBA2438757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474b408237d554dc42b0e70d61642bdcc978a4b5f2c3cc52a43d55c01ee72eb5. 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/QZTBA2438758.