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 0xc8437f566c5dbd4198df0d0103b9cfb8adc781414479a14a4f53d9e335264af7. 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/77c7aa10-c9a3-4f2f-9003-c6eebc83babb.json and https://artists.proofprofile.net/proofs/artist/77c7aa10-c9a3-4f2f-9003-c6eebc83babb.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 0x2a0f28b463aac4b1d830ffe9dc33e61e8cccbc9b4696655a82638f031957a366. 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/QM42K2012923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09ba0b034b2aab6f7eadc57f4fcf95e5c848e2f0dc97c9c23466af218859875. 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/USA2P2129112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025736e3213721a5e08bd37e5e4e244e51445ee8e056344c2ee4bf64e25169af. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USA2P2227671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9780ebbe96c961a50fd5317fb7ba5b603fe8d9597505cd999ea0f1b4a95ea0d3. 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/NLRD52119877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53876f64e3ac0c22a3b453cbbeab8dd88bca35ea965a023dad3270366acd31d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NLRD52119879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836bd2556084f8311bb0547403fb7fec9d3aa3af882683c91014308baebbbc65. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/NLRD52119883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd78df72a3fbefb8e0e9e79b14e9a9f6ff30e5bfb4fc8fe4e76a4dea4f7929f4. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/NLRD52119886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150add1f7b3fd0c2d001015ed44328af8028c8e9a01f2a26f97b698545e538cb. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLRD52119904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c146f5931334aef0d39fef3e598e0e8f052528d073ed9ba6204e0b5a3205e5. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/NLRD52119919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbd4bc38cebfd857249a6d27e75d742d83436334e801545bf7e510e030dce53. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NLRD52119932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b14955c3a3783dbbe95dfcc9178ffec38532266e818be7ccda4747d4b5c5fc5. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/NLRD52119960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa068bf019400c5d4cc3579d41fd62666104d4094ad49c990f03b47ce1431209d. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/NLRD52419109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943477b6fc34d5abce499d9f7ef8b4e8e29f140dbb18a8ab80439648185232e2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GX3HH2111372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bee5038e263fc26da915d84fe0607f8a47aa71e2fe2564d82a84ac91e7d0d97. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZP7F2121429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87706d3e2b8a3ea971442f247129e82104493eaed690c253ba3591cf4d69a409. 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/CA5KR2396313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc34a9717bfd316ec83c7f33cb055e94d56bcf5e724a3131532d465deb25587. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/CAHQJ2200214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcb29da5d24b3a7e82ccc7a34b207783e7d092786e572e78df024497150bfe8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GX5MX2206441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd14908c6bb1ebf2a99db0457986ae2eb45d0b516523ba06713f81aabe6ce26. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLRD52119918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474adb4d00fa6af877ac035b8e2af67194cdfffa4a1bfffec31bf056cc2d25fb. 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/QM24S2202698.