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 0xcb64df0d1e9c0c203d605f5bbda8178b552b1435e9711ee5b9f76a8e8b5a4e0c. 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/a713af77-0f8d-403e-be6f-acae52d84cf3.json and https://artists.proofprofile.net/proofs/artist/a713af77-0f8d-403e-be6f-acae52d84cf3.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 0xbb5baadb15f360d21ddf1f64623cca182e870c79672bbebfa0f98a22e4b9dbd0. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ES12E1801002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4d8193b689bb609c6ff492647031170c3ae5d7a2593f668f2f51fb17c58a4a. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/ES12E1801012.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f18e98f140f84bb92edf4f425145e08691e5c959567dc80ee3b1e23f2850c8. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/ES12E2201016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548dd156287a6ca46afdd1bc060145bc89a4c77cfc97d393ff583f46a1ee9355. 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/ES12E2401150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d7576add9757f73f53091b2467b56c3304a3d599036c388db9b7f028c2c253. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/ES12E2401187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7334f6e5f90f2b7800ccfd6372cd7a91dd4ccc89e58731cf707901394e83072. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ES12E2401233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33608d251d060bceb33ce8973843551d6cb9be72afde13a7872ca7800c7b3949. 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/ES12E2101003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2830f08d957d7105083874858a4a9fcf279564f8c73a978f30f8dd04a3dc30. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/ES12E2301002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8b1896920c0fd55ba019d0356ef8a8e632b8041692b4f5abea8fa22860976d. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/ES12E2401258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2830f08d957d7105083874858a4a9fcf279564f8c73a978f30f8dd04a3dc30. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ES12E2301002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173e46414cc1d1464d10f2def468bf4eb1c07e5ee482dead7af21cadac95fcd1. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/ES12E2501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4323bd23a744d5a7cc89fbe5acc1c0e5a14ef1691a158fafc14852cc83440885. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/ES12E2501021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597e7dafa428b813964f7093ec86887298dc703c3244abfab3b9360b05052bd4. 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/ES12E2501023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb90b0a0244fbde99037d4b69b727f99b5b8e5a491e64a4b943dc8a6467891ac. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ES12E2501046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6730aa3f557e4ef121d3a3594b3b52ad7455cae51e3bdd51b10b26f1dfa41e. 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/ES12E2501056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7de15187c1c4960925da4d3c3f7527f4b08b6f6a755346321b73ee0f78dcacd. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ES12E2201011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f72b28ae099e7e001d4aff203c11a6bc9e965c6c7a115bf538f95b9dccf420. 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/ES12E2501067.