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 0x44b5ff6b3016f80e2cf52a5c01c503f708df63a563e8fc107b5c8e2d18f3b12f. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ac8926f-fbef-4b44-bdf2-9ed40eae37a6.json and https://artists.proofprofile.net/proofs/artist/2ac8926f-fbef-4b44-bdf2-9ed40eae37a6.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 0x99c0431c78d5174b0a7b3fbe4c9679e1b250437d7e113fd167ff435f12406ec3. 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/HRA048148946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3a457810e7ae0e79ded8bf7ebcebbf0452b9ebc4a7d2186e447fae8a7f1fc9. 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/HRA048148949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba1ba97c9cce88b11165eeed88915f48f99f74bc2acbb5c8e2905dd1e801668. Chain 2 (Bitcoin): anchored in block 957624 (2026-07-11T23:13:54Z), 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/HRA048148952.
Bistriji Ili Tuplji Čovek Biva Kad... (Remaster 2021)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b391468eb7309d64e05aa6e97f75979870ac12dbeaa6c74e5e299f612a682e4. 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/HRA042095030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28c1c8645411cf244361731fc71743c39fd38f8095507a0db42b661066843d9. 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/HRA042095031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6410ee318be9e6cd064bb1a50eae80641d3789d6febccf03009368ce28746d00. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HRA042095032.
Schwüle Über Europa (Omorina Nad Evropom) - Remaster 2021
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6231b57646ed0020256eb8f80277d66b6704a34cab23457ac0761f9c359e3c. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/HRA042095033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443dac7aea1e5bf1b61ef2f098d034cf65e87ae7af3c93fc366a6679c2b4d2c2. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HRA042095034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db02da6e0d0fa8dbcb967649ecc4c89b6799176a69142ca2ffba18c01490ac3. 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/HRA042095035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8888bacb99822ffc1a1189c9508265b5d6b24d450c196ff893eba1ea0b0eed50. 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/HRA042095036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0023185019f97cdac8f44400537c4453dda396d72d1457276d5136fee44ddc. 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/HRA042095037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e098c598ccf0155744f94b201d1628ccae124838e534de1e0453d6d059082b. 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/HRA042095038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71fdfa312676f704881fed7cce60bd177b29c1e7aef9c884e09aa0dbeb6fd291. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/HRA042095039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c479115d0d647c05c6c8dc00299a00e4eddc7b3fd752569358524b85bb6d16. 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/HRA042095040.