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 0xa0f18b47bbe25172a871e766157d1b7a273aa4682e138dcefdf435ebae1fa153. 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/e6225077-a3b2-41fd-a4ad-bb65ca2b3767.json and https://artists.proofprofile.net/proofs/artist/e6225077-a3b2-41fd-a4ad-bb65ca2b3767.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 0x38d326fbc59ea097520726f5054255924c30a2fdd40263caa9c2da626c0035be. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/US9CY1300349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc01b5307097399ee199e7924c8f7d870571bb85b236529e22a9b8f11febf2d5. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/US9CY1300352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7f46ae5c9c0577aef830a29a66814bec433a8594467747a99e4577a330b8a6. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/US9CY1300355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4922a3020859e9007a3e7cb582af2f4ddec3ca187b15f33a345cfe21a188fa2. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/US9CY1300356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a953f85ff6fb1e5261602e82e867ce6be164f87426abe83491986baf829d79. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/US9CY1300358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810f693f951a62f2b320a5a9f8429c812cb25a244ba089546e18af672781bb2b. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/US9CY1300359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bccd8d3bfbd72709bef5f052d9941a310dd60e8da2fe24fcc555f42e50039ca. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/US9CY1300360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce1cb1077fec76722efc812e0dbeb2a1b97278f208460ed4dae86af8412f90e. 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/US9CY1300362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07cf71fc79cfcefe3c0de49c0006b683c2102ccd1bab9375987253a6b89908c. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/US39K1710504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe94e60cbda25216fab41ef94ef6aa243f45eeaf9d6f6c04d078a08a4ce10997. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/US39K1710507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91411d9da159d3cb00f0cbcc9e33104aaa19735b249657ea542a19414f0434f8. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/US39K1710511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4ed4abfe0af9e3a138dee1c79e4f8be2ad4520baeb49a8ba7c2104892390be. 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/USDHM2000129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9724a43ab956a395d9a6be6336cb19989014e029764343ef7a2856fe84981a37. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USDHM2000131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b27e9a69c24528e0b328907ff86b4b27fea92eba628d43ee91b5c587da2d39. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USDHM2000133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6e767b6c8918ec3c2209bd99a5e8f62f27f60c94d86132e1ee4962424e464e. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USDHM2000134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d51fb3b75c395b53ff8223e76dc127bef443acee8cdce7acf8e88c5594bd74f. 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/USDHM2000135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a1ada13b03fadac7fff5622ee77336e62e222f693dffacea1f04d72ad04f07. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USDHM2000136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd729beb1a49055e7adfa8df6806c9da1ff6cafdd3f765fdeba45c61fb9b5266d. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/USDHM2000137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9fa2904a5d5853c80da7b6341b5476cf0ec9c37874d6303e4cf723d5e2964f. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USDHM2000138.