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 0x04631c9f9d8447cbd650b901e5fbab25a2f0e975678e948aedf5b9c21b070b39. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/197120f6-e2a9-46e2-83ae-2deb4820a76b.json and https://artists.proofprofile.net/proofs/artist/197120f6-e2a9-46e2-83ae-2deb4820a76b.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 0x54c718720eb45b545467c23f609a3066f06fa78496bc4c32719bc1c01fdbbbc6. 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/DEZ651001468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0d8a2f8cca59a5d90627bb377eaf0741259837af226b6afc17643052aebd52. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/DEZ651001472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e76276cec959873ef2555e5de0babd7fa7463037f2b43000fc86af8f8cf3cbf. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEZ651001473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89c49bde3d9edb4154e7d4ea4a6b3e4c0d061a3d4558b387f070e0bdfa858c3. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/DEZ651001474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5951bca33837fb9e98345fc1cc1d4d3b2d0044a5d0aba75e7170078803405078. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/DEZ651001476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd38a5f31cfefa6f8f7562cb31e8b4e73f5d38b455e5190766a25d21640e5c52. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DEZ651001480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb566cc1d2ec78300b84cc80b2e8cc8a216df2b74a0f63ba324363583dccf4495. 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/GB5TW1100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974c9d859797f1974af5c1412908a304437987010e970918b3346cb1d2cef073. 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/FRX201828126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d6cb8ec4a63828b519fd6e0b57a2be2c66afc1c4cd2972580347ffcd33914e. 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/FRX201828127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c2b7007f48c8f0b75045bd846e465cab39aa9eb17b82653e8421769c3bf79c. 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/DEZ651702260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c45674d1d13dc9fdd441e63dc2ed2cc5fd9782ac2e6470ad9f7aa61816cd4a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZ4JJ1684975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68e3d1f3ce7c6c1d9fe935ad669544852e08093218e7ac66ccd9862c1d13e78. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBXWN1300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4609e490e5bbb7426e5b0f3e89c19226db7bd5d8109c1f71a73a46ce5e06492d. 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/GBXWN1300150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f634fd588fee1143c8f384a498634809de5d656d39fdcdc64217cc9593873fe. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBXWN1300151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f0f8f7f80447d88d65aebc975654808c1630fd1ebc9a255bb995ba84408e55. 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/GBXWN1300152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9924ec7010d567192e6277000b83b32a04c4a42f88c3d00863b42da04e5f2d. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBXWN1300153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8055eacd5f166b6d057ab5f7e9725e13aded22d011dc7a3509a2f0451e28618c. 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/GBXWN1300154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15221b307292a8fd33154357859ccd71ef22d0ffbb41347f0fc1b7f76299dc63. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/GBXWN1300155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a0e5729bf3e937773fbf5593af6ce308a95ab0195e3f653d43076a479bb0f2. 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/GBXWN1300156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3318a0416ce4fe6e074b87eaf321b823b1e1ced28ca90f36221c4baef4d638c. 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/GBXWN1100116.