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 0xfe698647517c91e19d5c89b439a2f7497dc7c72b15be10e03a0c9bc3e2553690. 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/27bb5977-cd8c-4efc-a568-2cd4b95a9c6b.json and https://artists.proofprofile.net/proofs/artist/27bb5977-cd8c-4efc-a568-2cd4b95a9c6b.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 0xb68c692515df962757ac1ea8ca5b5c466f872fe1785c2dd30934fbd24edb1498. 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/HKG732374100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c546b31a20e0038a81d7bcddb606cdeb4d54d61d1d6fd8c08dfe01b651f0521. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/HKG732271149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd380da202bb67f2084d040fa227014de9f4fff5959e5788f5146472f90e36ed6. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HKG731661253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ca3212b201fe1e3fc1e8116602dd5d1537f12f93b4d306828f4b3e48c949f9. 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/HKG731610442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94e65a0181607b2a9b702b3fcbc7cd4f6ab8c774a77ecfaf10839b366651c7b. 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/HKG732254300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73beac55ad2a01ce271aa870658c2a065ae80576f93eb3e854b391ef4f96a78. 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/HKG732292158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8df6d15b3dbfc4eb883d39888a234007129e1922862b6142214fc91b70259c. 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/HKG731661266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c3f72048bf7fc4718da6521c54faa74be729f949719c7f06bc334cb0ec02d3. 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/HKG732450921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283de494bb4ba50c3c7a246db5a4f9302c4e70c26703f7c7de66d706e03174ae. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG732352274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e8098e9fc1f11c80f68f8cb9277f0564bbc039b68478eed2099d5c28abf02c. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/HKG732424073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259a6fe167b14804482dc31b8ca35d2454c2bb2a79e6b9ee56a2f4e3c4130965. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HKG732382926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55783c7ece412302e880960bba82f50acf1712d4d0d5a8ff71915c7572a01d7e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/HKG732345451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b156972ab0ca12c409927fba741c58dae84e8fa89633d708e47a41a9cf2958. 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/HKG732274420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34620b766131e1514915fd4ef78a33e4caf06d947fe3aec217bc14d7789916fb. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HKG732468109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c77d4832520c7d93ad6ef0ee64780679182c89d3e961f9a48e164553d989d0f. 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/HKC992625374.