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 0xe4d0ff7f6ae3cadde19488c40b27384be92ec75ee88c92709320ae0543eab017. 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/8b3f9676-735e-4043-b677-ba476f49e393.json and https://artists.proofprofile.net/proofs/artist/8b3f9676-735e-4043-b677-ba476f49e393.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 0x781614bff6f80ca799b30552ef425cb5325ef529d835e15767ed772114a0ab6d. 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/US3DF2293365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d17eeae2f15c536ca73e3f8ba7a57516ac7fa517fa067985f88ca78ff7eb52. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USHM22236250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee25dcf36eceee073f1ebabcd3637efa5fe7c00f9c73602d34d673e9054fa98. 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/USHM22236251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229991694626ad3688290fd0cf9aa52e873aebf85a1c63a0e911bc96be7b337c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USHM22236252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331ca0af04e68c762ea69dd414790c8a9f505480d7037f103a5313389da717f4. 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/USHM22236253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0377dc3a7887aba029acd1fac6b89761a8c5e162bc0ed928346414cdd2e68611. 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/USHM22456482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd1d0afabc3215593ecc0f0d36ef8c1d68d2644da378b723c52345c6ca552cb. 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/USCGJ2451021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f8d851a31fc90573c886e73e6f3695f6e2eaba4c5fc4c5f2e2f5be121adca2. 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/USCGJ2448181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8277a6eb1c3ed05f034370449f9df33a221e2ca1b0231fa85be0c8f72d52973a. 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/BX4IU2356050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb253d1f388d664b66e707a74add3ce70c8d655065f49480761afdb979dffcd. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/BX4IU2331725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dac71329b4c56de52e7e855b770d1a108e8bfabf52362f8944443426f7841d0. 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/USHM22310792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986eacf7e8a3acaee278216b7d8333ec7afc2e4ec3c67269335429513b216eb8. 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/BX4IU2310054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3093b617e4c021965547b3039d14522e25da11710a10fab7c6bdf2932515dac4. 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/NLRD52255784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4a16efb94c4225ed105f14e42f0cb13a5d5978a12b7de1c3d5dfe1c636d148. 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/US3DF2225134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60cbbb7fbbc26dee0b1b32302b99e4a4253c37908bde1773a1ebddeadc3f750. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US3DF2224636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa353090c9a82356a248f99f819b8f7a56e97da4b8d8d8fdbf8474e2e485b39c. 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/USCGH2249440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd812f081aa967baf3a1b971acc0aa2f16ac9a2128d6c2f1be893fa8cba59761d. 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/QZHZ62161678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e36946e899a3a88357eadc72efd5af4c5ddc909e5fbe10de4e98acb192a4c4. 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/BX5EU2100051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01988235498d5156d8bf566890bc72d276bc06d99bc8903e8a9a2e38783adc4c. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZGLS2416128.