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 0xc6850255ca7f5821f95c926328c5521f1c8f75a32c9fd7f0ce81ffacd72726a1. 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/43f7ff54-50ad-4ba0-ad3a-a291358a18ff.json and https://artists.proofprofile.net/proofs/artist/43f7ff54-50ad-4ba0-ad3a-a291358a18ff.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 0x6590e2e6c6a5c0afdb2d5bf045da8dae3a4fdbb4d2407e363de1c2d7e8815535. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/TCAES2051355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79fad89db2b209e9ae3929b67c9c3a850e503e5bff0f1f9570efe18f5ac0c503. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCAES2051335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ff331d2d43d62b8a31e625e37e4c9ba1b48855ed616848f09553a41b6fc08d. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAES2051340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c71172354e89471ce3d9a4997508c3e6867431271fa290bc9d55434157e3b5. 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/TCAEM1982009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14b472bba2dea4f940f61122c644d8dabe3bba6667f306dd0a648b8749348da. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/TCAFA2052843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddffecc2234babbfa906135d90a12920a93942a9fb9a0a97d24b31d5f492e571. 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/TCAEY2073201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f24fe8b30cde98fe6a7915139ee898662867dc0d5f0e1dade5eb6bb7aae8f5d. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/TCAEP2053790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3b8c96299e40d00892015f96e273d41efd0f0d68f00274eee1917dcbe367eb. 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/CAS742188801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124d9877a55457856d5481e2d1b6f4044ffde5b5afca82bfeb0095ae46335d8e. 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/CAS742188804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ababf2aac1c886bc593b5e0bdf4648a98e4a8c71aad2d92bf180fedc1171c7. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CAS742188805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485739051160552e37ce6b1cafdf0e9c6924926d08fc2e9dbb862a86a98cdb9b. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/CAS742188806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db5f9dc476228a5b18f0a5cc580eb6ac59240816f7bed40354cc9097772284e. 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/CAS742188810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52a32b121d3ec543401f3047b397dfa8bf32874e960b561cf4ab5d58ffc1e38. 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/CAS742188807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8486fdcc670d13261e5d09aa342d72c24bcedd866f9ebdb578af74f9682b8b4. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/CAS742290801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19860c7c8175bb81b9d6756c2e32d9da9bbd0358e7279a80be8798bf7009006. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CAS742290802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9798061e5b5e5a5e1ac2cb952ebabad8b0d6bc70131664e548bfe7f275e45c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CAS742390804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5717ac76ff597f0409b61862416731a6676b69206aa077fc423fbc04705fe5c. 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/CAS742390806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f3406172457ab53fb190d95b39c6bb39d5f0c5d29e4941d364e7bb6842a5f0. 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/CAS742390805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003daf8516d8323a319303f1a6b83cd72114ae3727c13612c3f479978580b2bf. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/CAS742390807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573d05726ed1dd59cb4ef561e3f4b8903aa9557be41263e963e8d8aa461528e3. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/CAS742593111.