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 0x1501b32c48a14e1fb317f783166c0b9afe5ac8d49c71916c43f98aebe25102b2. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/26d2c526-8e2f-4875-b572-d5411cc66c6b.json and https://artists.proofprofile.net/proofs/artist/26d2c526-8e2f-4875-b572-d5411cc66c6b.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 0x5d2bb3335fa2bfae3d33d4598ae90f98adb0b8eedca8ca161dc3e6e42898b250. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM6MZ2257448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164b4855c9135defb339f40ec20ce07b1f5c2451bc5f90c601ee9a9e873725ad. 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/QM6MZ2257543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e2ec272476e1bd1c9bbf80828966b68711815125dd924765f0a01bc43377b7. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QM6MZ2257642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ef8a6db61f5032c3475cb46ff6964f07d01a458ab9c6a383edcad92c1aea4c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QM6MZ2257661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e1f335ca4e9d6153e924410c515ca65ae780a30495f0147956b79b093d9f1f. 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/QM6MZ2257762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d28b28bb76058dfd948aba17237c7253ee8f63db4d11ff04d17656c56d29b05. 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/QM6MZ2257765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8fb18fa1fad5d91166d0f889c4c0776545fe42438d63ca2b1179e0d59b2040. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QM6MZ2257769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2e1176e6d311ac52782414fbcf13e23a60f1b4e065367400d39f9f88986d7a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM6MZ2257798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4271e1917b946c621f44469b0c12c7289700d0ccdeb19f520557ec06a64c07f7. 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/QM6MZ2257802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177d420a0f32b7547b4101730f9a49882d40d9f95b50fa70bc3297a9201500f8. 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/QM6MZ2257806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a80243a4590690f62cd5d221c32c9eb895ea8ed728e4b9d7a964f75eaddb8d. 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/FR9W11915704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba0b7bde42376c7689a8934658b73e763ae0f0dbe41c1d6573ed7c2cb7953d4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6M2471356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e9f1c0be1112b4051d4fa7eee8d202f3f1b9ad384057007e3704c3b6d2d639. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZFYY2457318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6a3cf79684a6f0e7d0ded093e87947ad16cb34f8e3a87690d9ea8f9fea1787. 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/QZWFR2396333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fa19af2e052b389de3c04bfe0c723b99afd8a4cc69ce535ffa25ee12a7d5ed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYY2457319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24104c46734f92219c04b97bebba550a9b173638a69f8b68fdecddcc6cd7d1d9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFYY2457320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6a3cf79684a6f0e7d0ded093e87947ad16cb34f8e3a87690d9ea8f9fea1787. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWFR2396333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b80ec0ef2930f1f93db54467851b2360aba28f77984210530f0faa5edbe65a. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QZNWT2336338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcee9748252dec99ffd19455b5d3975c8d815b8b58df1ea1b7fed6625c1b227b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6F2363926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9b094d89558b8be7b6991d5f4aeb75fe7f16c424b5d46a4a07bbfa78473b45. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZES82358236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1b471889eb81192de9cde86134980bcda03890e15aa97ae7fddfdc870b3d8c. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZRP52212661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804ebdd4886fa142b05ae7d0791b8e467a9304db0dee197920d575b21d0eb5ca. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM6MZ2257518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e77355dfd36693a99d4a56176052195d42f43c4d8f352945574606f6f2932d4. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR9W12212252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf481a9560c0ad1eceeaf2c5d509988da6efc658a60dd033ee77785f587875cf. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR9W12212253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d3d3bc2dadcc6b04203141881996c4a6f32969a7c2fcd459135e5c93ee673a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/FR9W12212254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d4c82a00150ee88acec179f75d1a980a26b755299e841bd9033c6bf01ad72e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR9W12030422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a80243a4590690f62cd5d221c32c9eb895ea8ed728e4b9d7a964f75eaddb8d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR9W11915704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161824b3bdce6bf8912ac4b443cef09d5b0ecf1a92a37842eeb24df6ad187286. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZES72247293.