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 0x300e994c7ddc9b1a161b05c0c5c4364c80adfb9d071cc0843e0cac8b442899c7. 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/f931bded-0f53-4ea1-9661-c5e31ddf2107.json and https://artists.proofprofile.net/proofs/artist/f931bded-0f53-4ea1-9661-c5e31ddf2107.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 0x70b05d156d09d3e118c4f52aa371b98b3995dbf382e544501ae188ea7a78a27e. 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/QZFYY1906731.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d5ef5dfaccf8184140ca598ca86537037cdef12efd98f77292f8965718bcfe. 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/QZFYY1906732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24bb37f0fedbec970850216300e37a408807aeef8d9e2969127fb6290b9a99a. Chain 2 (Bitcoin): anchored in block 957730 (2026-07-12T16:41:26Z), 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/QZFYY1906735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04119c3337b2ce1af3e6ca369d07293e90adc7dfc2c2fc43d9cfb7c4c3bf7715. 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/QZFYY1906736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae273a7ff7da255af3ef860e069fed8979d5c603e6a79a27e283cbcb12bd780. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZFYY1906737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2be8e7d26b53dd5a23cefaa851cf088b421373f2b0c9adabf09bc05e968998. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZFYY1906738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f581e677e015d979a42965f7896afbd2afd3496e82a273b80668d77aa489c5. 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/QZFYY1906739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7634a4dda5aae9c1750ee9d659f12ae90b039d5632b95d574111de4fe34f138b. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZHN91980484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8391db1ef7850aa846eb6a4763e94d7e4fa23cd07bdb992e2f0069997b8bc6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA42022093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f92a0703d1aaceb09d204a2b77e5b26dbca568b4d614f2142c20735c6ed62b5. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZDA42022094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4c66c4f603d4918073ec09d37b21a76f74375d86f596f9a46a5ec0d3f8f1c4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA42022095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9ae39ce42d7affea51c7fb85bfc4f4e9e875f2012052c5128766f10a40ea49. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZDA42022096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a231a8ab4569016e731787a74904fde0f7ce889ee98053986f67ef2d8c47a8. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZDA42022097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228a83259635fcb87e3eb04488da03afab973b971a31852408baaf3688af3bf0. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZHN91980483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82045c85f9136befa19ff76bdc622312381089e40077e9c72e1b463b667c0706. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZDA42022100.