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 0x25426ca4d793729ce5adca51c45e919a5420f0cb3ac3bd9286e813cc679daa9e. 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/d9c11dde-0735-47e0-a100-3a94bc25e7ef.json and https://artists.proofprofile.net/proofs/artist/d9c11dde-0735-47e0-a100-3a94bc25e7ef.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 0xfc25fbd21d200140c495b01cf7593a280d7e5549e9628972543b39ce148017f9. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/TCAFG2049981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ed513a996c496a550b493ec20b51fcc394a094dbfe214ff173ef493a394d00. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/TCAFI2184861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cf0852be2203ddb7984b23c25687b8911cac0eb2c219b88ba0de4594116feb. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAFL2136815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fb7e9d803b24c8dab13e1cd3b3d68f2ae3fd4a9f6ce40476580d07cfed815e. 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/USLD91735379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f99daacf948198b38f52b8a2121113ad084dd838dfd2883580d4a41703d8e7a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USLD91735382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd242e66c791718a57255e7975521c3e24d431b04605c7bdeff93ec1e7675b303. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCAFP2126587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7abeecda051dae12cd6903d7a971bdeb9278481813a0df13ff0fccfde5b1f4. 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/USLD91735384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5fb6c199aa8348268192ac7976d6da94cf16b4c3dd89bb6dd2a4e166437cc6e. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USLD91738106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2e41d7bb742014ea73a421ad157969355c96f8ae683a5f0c0b0fc7d638ef58. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USLD91744874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603f900c4b68f1142b69d783086648d2f915b9d5465cf276361d7a83c1385140. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USLD91744876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a4d1830ca3b0ea723b5f1de95bffa04a77487e22fb9299a0e3f6a580a0f1a1. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USLD91744877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297685ec15803365ed314e33a4df389048f24b59bfc01007385ad5247f2c7037. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DGA092355713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf945431837c851eae5be9d45a2701d66e706f594ffba4f8a17c102aa3a9be70b. 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/QZPEW2479541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e706073c65cab5a207cd67ddb9e2243d035db7db950be48d7ffc1fa06e75f1. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZPEW2479542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652e27007d539458e2d788ba802093a30a4ee7f3ad1d66b1b428184a3f300c64. 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/QZPEW2479543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db150be4f8f88a0a4504ec73e48f97116203c70d2c39e5cc1278cba85427165. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZPEW2479545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd902af538894bf4bdb94f15342c194aacb59d008b303250bda415a364e5efae8. 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/QZPEW2479546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94893e918be1833fdd72b134cfee78cf991b8b4db7dfe098c10176c4cab02fb8. 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/QZPEW2479547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b74be490ada78f24d0a36f703e3f65c9546e9637b90c72c7bdb7265b861ce8. 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/QZPEW2479548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85180f2170864afed44dd3811748b4211cbb6ed76a741f15b59256a9e664639. 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/QZPEW2479549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf14270549627173ced79826d10c074bc8e747b328d0bed08df3421cbfd9e8fa. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZPEW2479551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5fb6a814bd3131fe84a31bb8467d91b62a336d8c3861d2111088777068f224. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USZXT2453372.