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 0x58f91f843fc1ca06b20702b38d5c1a1945369158d6791dc66fe0d4bbb36f4b12. 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/6a2d44a6-29b3-4a36-8103-3ee5d06e6ec0.json and https://artists.proofprofile.net/proofs/artist/6a2d44a6-29b3-4a36-8103-3ee5d06e6ec0.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 0x983f0bca6a5adc3b7cc1a01078b1af93aa9ecf4b72d2f54e8effcbdee62641b8. 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/GX3Q92339222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53655b8e417fb18bc80be6e901ca107b9e3c53121be44b31cc5fc48b0dee49a. 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/QZK6F2162478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb96be1a5b18f15b87e8c5c8136b9130644beb3b902b03ab7f2ba1005b4a732. 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/QZK6F2162479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bc00cfb65a975a440c8a2aeaf232d90602f271173c327753ba645afa63961c. 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/QZHN42173930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626bbf52f0f164849467ebd9ff4272285af6070f40ef20487d628a52d6d31f64. 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/QZHNA2177504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2caa50899df9ac99476ca77efa4d0e0c15bccd78d2222f0565ce4b722d76ffbb. 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/QZK6F2162481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865aee47bfcf51610a4e377d60598f8d5d56e9b1d5a876210ccbe5755d65b912. 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/QZFZ61911019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab7e3c63f1664cbbc826782022be3d04d0825968bd352b4af518c32c73bcbaf. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/SE5752410922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2910631ff68646f21302f78373d22006f87b6caa09e4e2dd6675565450f99bd. 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/QZDA72481430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9a07e35a6dff435a60dbd0c34fff4e9a08096085c50ef7e5068163b0e2e509. 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/QZDA72481431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8912d4d090d3b2cd6394ad632faa304e3164af47fc262e16c94633e38c70d776. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FRD0K2302540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa0c36f87701060e17c8d22f0046f354650700c7316b53a0576e54776f29195. 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/QZTBA2236516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ec261550c2b577fb393be43bcad989144b06664e4c8f52d5e09911756418f1. 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/UKXN22252337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7958bb99840b075bb31790db13ba7964cd60ecab3e0f386e9d5b09a95520a3e8. 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/QZNWQ2276608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12afd65ab79d9ceafe3640112f31284a151b857494307c3298dd586267144394. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMTND2200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74cc2720279f64e0601df1abd84077d72c4c320d5f5e2329811699920c74bfe4. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZFYX2210893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e50d5027d0853626151ded24d35175e67db382ff1188d2e7a82b8fe830a8ed. 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/QZFYX2130306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88561be1ac5119fb460426983c70d5d68441b3fd021ad878aa859d498622d49f. 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/GBLFP2100446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605174e2f05638eb3ecce2fd7659a9e8b1cb60860c06008b3aebdeb5e7418253. 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/QZES82023461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac74633359f376ef23d8b5aa2dceda5ac6e42428e989880ee7a74654b88ec704. 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/GBMA21920592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9943353a241f0efddced0c93feec706512babc4f821418730ebf8f7197a722. 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/QZHNC1964871.