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 0x892f877ebf8304f12ccb1e35478cc0b0960d1a99c3af4ae24c08a927fa54dfc1. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfacfc40-fa6e-4a76-8cae-44ab5a0d8e7b.json and https://artists.proofprofile.net/proofs/artist/dfacfc40-fa6e-4a76-8cae-44ab5a0d8e7b.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 0x16757df63287d30d56805b173a26cf1123f38dc03b3f2608b0c525d129f0f385. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USANG2282204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a4bddf3082cd89a36515f561e5862e261baba064fe5e587230afe68e9a756f. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USANG2282205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc1609edf6e46aab99e0b74d89dddd43d2abd2b83af339aec32015a605d7548. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USANG2282206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3340c497cf8b393b89de1d36e05587a9013ab8fd32d871f3b2c897d40603cdae. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USANG2282207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157a0dff69d3869bc52935bf17c70fc92b33df5919f619e1053a13353cc708d8. 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/USANG2289594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4145dbbbe05ff05ad8562ec09ed9743c873bb0095d484739d801699d2d454c2c. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/USANG2289604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7661693fd1caf1feeec22e482cfdc3a391ed366adf98d0380d1a123ef1e2d3ed. 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/USANG2289607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04127982fb3ce248088b2ea6fd5a3571e7bd3dddbc3963acdec7af7943d940d. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QM3DF2255553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53cbae71292d86a7264256baab9d898b1667301d9b3376fbda7881d4ce0b256. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QM3DF2255554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70763f5ca693f3221bf39f5a7737f8f21b98afffaf7be37dedbd43eeac6fa266. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/US3DF2473284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea9e01f8a4b85ed04f16a93299f622a37782ea6856d7b610a0e963db00f8dd9. 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/USANG2472199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccf043b09c6e72202c41e99faf2fc85f0b5b392d95bbf3ce1bab7344599092d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USANG2472197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67688fca865ddb62d57e930f6f77c539fff74f58de46b0fd7be18c6640a82e5b. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/USANG2472198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a11756e86e2aab71c02891d56fb51ea1939540a6a2e9b13e35be310bb06e55. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/USANG2472196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba675e482ffd5bd7d99af6582801a0ca2441e88e46c9aa424e763b1bbb634ba. 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/USANG2472200.