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 0x0601d83c5a8641ba9b4fb02b17b2429d708d0b10b0112fda613cec3290118676. 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/2608466e-ca18-44a8-9d7d-7ba287ae8557.json and https://artists.proofprofile.net/proofs/artist/2608466e-ca18-44a8-9d7d-7ba287ae8557.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 0xa4b226bda8b7589946f7269ef2fffeeec7563bdc482cec5cbb829e1b36564155. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/US3DF2212372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a99d09d3215108d567f02567383c229e7b80f07b7d2fbc66652de7082fd07ca. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QM4TW2302697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48760d44d54ab6b4feb7a3c7dddd9e40456273d2742876df4d910234c3e0711. 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/USANG2261654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94615f1ad70c6249a158a19d74f7f1e516efc20f8e42c25617101284df1db69d. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USANG2272392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1657d43f879ef8eb37bfa89454d28351449ff68ff5aa13745b96e1126fe4a11. 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/QM3DF2211816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1defe2952a4cdf49957f77cd142864d83b11538e5f447bbcb8f55fcd27b474. 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/CH7812347516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17725471289c5568b0ea6ec46eb9de8cc073d51caafa9aed9976ad3c2f1e87d8. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM3DF2276312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb98eedf342c88d8e2c0d50c6cfb698732762211b7e91576bf14afb1b23098c3. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QM3DF2275961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca6ab6b8bcd20e3d67c6df1d99da13790d74f533a0023eefc4f554f18cde8ce. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USANG2234261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4de2276ecec5cfb82b676b38075b3f1a6110b56353db98b079bbe5cbd7b695. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USANG2250189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffe9bd0c4f5b23418ec937fc5debbdc5d50b73c27dc140bdd84bb11aa6489b2. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USANG2250191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28e77bfa78693ab425e94db7cb60bf8d837753b2d3bd00b21bb8c4ccea2b786. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM3DF2265682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f417883052f86ca253dd4a201f70eccc2e8e93dc72930206d3281acb8d333aa. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QM3DF2255117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7ad23b2e1588645827738490d8a3547573cd7e183649155d9f780088e5a572. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QM3DF2278186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe2b57e9bf015398623f43223f045458088e572bd5677b53640ca56bd208f6d. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QMANG2482463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ff1bd1da4ee37fe54906620dc113db91a420964fdd2318fce88bb80fa102b8. 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/US3DF2410942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef0e27b826049b246337a8bdb8c5c000dad02c40d1df6f308aa9439bdc13755. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/US3DF2431523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7f6f5f41d3de9578b1c7cbf447c8e469c2d5d801c0ab9d4304d5e2d2b04578. 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/USANG2489811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d94d11dac86a75f052ce79eb3347a74a9a5eebc37820e32dfd87c6c458ab5b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEZC62572808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354e6964d1734706c48c2b0ff3cfe86ae7f4c34230cd06e67ecfc2bfaf70a128. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEH742502507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4fa0184b3c148e6b5d6ddfe599ecc6781a66722176fa4b94662ceb68a7173d. 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/DEH742512262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3257470bee33459253192743e71e0b04a1267814096dd7dc7ae078ff0abf4d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/US3DF2536529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb99bfd90ecf2ea5468f69fe44ba48f73ee27ed849caf0908dd791fe3d459026. 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/USANG2519332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80891cd22b88d5fc4e9c0089be0bb33a7b702a7113b49e64cfe49129ff51dedb. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USANG2519338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94615f1ad70c6249a158a19d74f7f1e516efc20f8e42c25617101284df1db69d. 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/USANG2272392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7520b59d2d86416fe141a4d9046692fa9abbc80dd38588fe55e4c16443093b. 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/USANG2294084.