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 0x3602832226b8230125f1e1d8302da6487bdbb5aaf83efc188dc128ac05e35efb. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63e160cb-1671-45f5-a607-939a164eb415.json and https://artists.proofprofile.net/proofs/artist/63e160cb-1671-45f5-a607-939a164eb415.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 0x8c38bfa1eb84d6a01cea403fc768e486bc4db3fee079921a716730db3c84d426. 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/IL5821500903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68d9be8a2ce2d44f099a746544e5633a1842075bb37b022993182c0aaf1fbb7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/IL5820600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe48c0c9142adb18102362b0570e67f19471928e6a72c2183cd5ced62f1ea8f. 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/IL5820600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9318725c4539522cb3f70e97d029590111ee3c6d1c98af6311d89459823ef5bd. 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/IL5820600030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07193c1f09cee3e7ac8cbe9d2253182979d1ece9d14d22658c300b4f0315e62. 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/IL1012100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb317cbf8310af16a1565d96172239f9c6471201d9bab1464bcc382ff5843a3. 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/IL1042501241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306adcc7b99362f53c1abb81d9b0f2d31ff7fdfb378f54c331e54308487ba06a. 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/IL1042501231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e904723a9542e03f3316b8ece54ba12924bfb57e2ce32d4e7ff3b870dcad1c. 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/IL1042500831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e810702dd2f2130145e3147c57063dc474d57f00ec53a85aa0359857814b3f4. 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/IL1042500531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f841087ffc4067475d47001fb535d2c6c63bd9d505fe14529b696ac9073cb0. 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/IL1042500471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f69b1e0db90ee50e4fad1a6e4f14a76d86a0e466089cd7f1545d74250fc9f7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/IL1042500401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07f87243506c1e644bc7a996bcabc8613c529d05bd8ebe7fcd6ac2e08c9329f. 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/IL1042500131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a13f5066de0fe6e310470156adafbe02c471338da120f81828e228bcb0d87f. 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/IL1042407321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4f6d9460ce16c88b62f2c6e3e3581dfbb3c6a182ecfa6d494e6185259bd3ca. 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/IL1042406341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97ac1a58b292e2100e20e23816cec14120901b438414a0591c0697544d3dc53. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/IL1042208461.