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 0x9125f60a6f738249abf05632335cc49702edea94dea9365e0ef992028a15af54. 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/e7348831-cded-4d2e-b7d0-7473f91127c1.json and https://artists.proofprofile.net/proofs/artist/e7348831-cded-4d2e-b7d0-7473f91127c1.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 0x2e2c00a2437eeda1fef17a9dd59449fb6dfe4b47962aaef3cc81eafb1ba832d2. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZNWS2173615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72584b5f69e64df48b0762c57bd42f403fbdb60cfbd240edae39e37450f00836. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTAX2245065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b273619329c5b5b803b9252f8fcea923d2497c2ebd8d99f5d54254bb3eb40a. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZWFN2396921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5a7e53cf50bf6cd8a0af690871e822f678a3072a5b9dc3aa85959a986a2842. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZK6N2412839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043271fd84c28ba58c5b4158432a7fa7a4b14c26bd95e750fde07148d1b66277. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZTB42424662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043271fd84c28ba58c5b4158432a7fa7a4b14c26bd95e750fde07148d1b66277. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB42424662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefc5506d2362a4989e8dfd0cb40a5bc957ee504590ddbe1b8ea15ad69667650. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/CA5KR2514236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6532addd9e2fec8c18b45b2e4a33c0ae1b682de12f22955be7ef23fb53bea55. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/CA5KR2528157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8c255a7e90cf719ae29521f8b9f42f60ab41eb6502d22060fcabfe501a13a4. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/CA5KR2533150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd7e80d9a790a6ab76c5e229e281a86d1c068cdfaddf20d49dc88d02308d78c. 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/CA5KR2536552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6532addd9e2fec8c18b45b2e4a33c0ae1b682de12f22955be7ef23fb53bea55. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CA5KR2528157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c88f0f6bdd2a7145b44b587ee8f507f8f9e278cb82262c90c4fc67ab19e3bd. 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/CA5KR2536553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9494dc8a92e18dfd9dfab145169619f9d2a759650da976bacb97f22ef145333. 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/CA5KR2536554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6f22333e6c7766a2f572cf80f6aff89a550128cfd9060feb760d7363ae7f38. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/CA5KR2536555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588f7409e2ea42daebfbdf6ab1f3c12f082d2cd952864c2840f0ebe5c2e17544. 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/CA5KR2536556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72e3c456e55e3cc77b39663081b662bc7fe1d747b0baa087190493716dbc9d7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CA5KR2536559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20571ffa31f465ca16748049ba7cb8af622f1240621ec6b05765f6e7852ed254. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZZ792595805.