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 0xa2fb9a3ecdd8169e2fc83caa62f70c6a0c26afe483c42bb66a4858ecb019dff9. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9173916a-5044-4053-a261-1ce65d5fb28b.json and https://artists.proofprofile.net/proofs/artist/9173916a-5044-4053-a261-1ce65d5fb28b.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 0x76c06f18d90e9111ea7df83622ac67401f20434a4c34bcdccef12c6591a83d1f. 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/QZ5FN2377450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1ef96faaedde4199fcf6aa5b8a4c4f4d14e144a2fb913cfc2755459669e6be. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/USLZJ2358225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab22e0b6686dd7043ab29fc54592caf002c99a300e1e0646879d5cadaeb81f3. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZTRX2350212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89eaa0a6349d401d9aef711e20d785ab71c4fb1a0a0a0cb402c016f23d95cf9. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/QZZ8A2459435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c871ebc035a4ff22641d8590cfd939e2e2550ad2bdf7015558b45a0a609fc08. 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/QZZEC2468524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146d33c568c615ac5be17e027d564ccefe850ed776fd5dc97a0b6ea86c6d2e94. 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/QZZEB2401514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de8e1c77d61d7a6a4db70f19af8faadce3c7b82ff5d92af8403105ad06c9113. 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/QZZEC2468506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554b70702148f197d3a0c83d4bbb0017df31ed71f0c6139b02050886646fe4f7. 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/QZZEC2468525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab23e0b6235505da4095f2763435ce4ed2a5b6222f05fbf09f08fd86d6e15f13. 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/QZZEC2468528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc01d0eaf26435814a35770f3a3cefd6582b23952d4d8d41aa3ef3cff6766015. 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/QZWV32370104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e99760fdeab24e2b3bababc49afc630f1d7ea271d34fadf324a6b7beb13ea38. 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/GBLV62300262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010c7f08c00b6a43f350acb7bb1ca5dd735215f9cf71ab213e836bd03cc59178. 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/CA5KR2425023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0d8889b5bf7c434adbcb4455e16b3b2f44672b8f6a3d7e38b8414f8bb35acb. 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/DEAR42494237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942d99e960a3c58197a8ad8aa7bf3313f1942542683167bef0a3f0a72e42b54f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ZAGME2400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da495ae7c038a552a767f7697e382f895c26be332f755ab4acf55720ae706ff. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USLZJ2394553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52824ba6d10c19e3dd75425bcea1f337c15b9aa16c5a7e4852cc87bf1f1dc566. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/TCAJF2524640.