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 0xf96d655cbd71014a1c6f57be88d19db4a84fdcc1e61a95588eb35b83a7ae72f7. 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/c45afd68-e7d0-4395-b9cf-37aa0e51c464.json and https://artists.proofprofile.net/proofs/artist/c45afd68-e7d0-4395-b9cf-37aa0e51c464.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 0xff040b1660ebf111746a97eac78c501a1dc7c9c98925ee4c706c0347476152cb. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/PTVI11600066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e7ea324239e2536499837835831c3ddaeaf052df25795272edfa2e345bc0f4. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PTVI11800067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3971b501ffc0af02d1b4c9762347cbca51e4dedc8a1b6fab1e790feb020df85f. 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/PTVI11800068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434a2e3b04b533622026a0892dd340db592c97f6c2cab8d83a55e254c55e9c54. 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/PTVI12000527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ec92655f811124b1f4927d89212dc98da1230fba773558b4f1b530eba94be5. 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/PTVI12000528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd698f5b40f9068a2179faf6d7d872662dc3d7f06502c9bc326096c21de419891. 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/PTVI12000172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dd8dbb31e87f7f7e2176ae746db7d9b4c6ab702b9afe27d99d9aefef139a6b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:03:51Z), 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/PTVI12000529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3db6b9dd396b952fe38ef94f1afe20397989a617bdeb8ce58c1077d6c53c569. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:12:19Z), 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/ES71G2153595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd80724b8d2e465a33c817e35f48e5d4d2a44e76247d249c54ded2bc05d59212. 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/ES71G2318702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77ad73f4c46bce7912af964f5820be8a876a68b24bcecf839ebc43f0ddb4098. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAHP2338901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4c9d13f3cf1092bbe11715a5661ea8eb84820678303e3ad5838b55430da4cd. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/TCAJB2460893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b1ad609a826f20bf0be948c26572efc452514fc3d93680b6fe562e572302cd. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:13:56Z), 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/QMDA72552023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94ab8470d729bb8f386e456100c57a86c5d91ff0613bc18408d4892c7e2870c. 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/QMDA72552031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f2efd7432c654eeccd3128388a55c71d36aed0990e995584bc25e978f6a485. 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/QMDA72552032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03384399fdcbcda1e50f2c84ef7eda3aa910ed96bfd77a8845b7ae8f64bddb27. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T05:22:12Z), 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/QMDA72552033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca40f6e1eb80048c03638150148651b8239d25b7bf47f8514bd808809fbee49. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QMDA72552042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df2216425280e6e05610f85f53062b7a7007570c397b76f67491cac45591b22. 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/QMDA72552029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabc15303df1e79d95662984aa4d3ac55cd2d2350325c4a9963a1f35230aac2a. 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/PTVI11400354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6b9bc9c0b8d6d68d60f67be6c0cbaa8aa9402cdedcbdc986fe27f5a31d4986. 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/QMFME1594912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876fad73f24e19cc5d9d7777ce124f134b1ea84c9c567ec6172a11bc2e2299df. 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/QMFME1594920.