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 0xb01f9368d578cd1c5838b3186c063e51633a03d6525678a089518e0f0ec302d2. 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/765b7c7e-66e8-4352-8896-369f2020aeb6.json and https://artists.proofprofile.net/proofs/artist/765b7c7e-66e8-4352-8896-369f2020aeb6.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 0x58bc0cf8c02be2eb3b1d7713b756d5566b52acb6bc98bedc2ff67c40d6241532. 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/BKEHX2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42bef5fcddd216f353f142538592c682c514fd51339e3df5a460267e837bb130. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BKD6I2400275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef54faf262250af88651c8d7de9c6db376523563aa3e0f317feffe284fa20179. 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/BRUM72401224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce03c9039665b1ea7753a2219a1c7cb8dad19a3c805f79f0d2e0e283d071561. 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/BXG6R2400445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5caecec25e3cdd5a5a626cb1aa368ad88aa511b6cb226e1ddab1422b3fe1710b. 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/BKD6I2400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ff79342b0b6e2b2c68e8f3959bb176a46ac3e34d6a78c0d94f8552b38e66f8. 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/BRUM72301857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ebd95a4174784f6469d06da006f827b0be18cf7c2c1115d35062545f1c5cd2. 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/BCM9A2400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47acd23c1de86ceeb02c53e729f56a77c432be1d2592d66fcffebb05e76c3889. 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/BCM9A2400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a588a9f96300c676d6833a2b777cfc59743935a8e73677f59a8935991a580f. 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/BCM9A2400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a45c9b944814cd72b5fa4aa1998e4df0d7a93f762136bf16662e4e2a4ebe0b. 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/US7VG2571123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf867c1d43421497dc4d6cfc5be96eda8e6a99be37c1b3f200ba2fe8d871c397f. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/BC52P2400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ceb458efa4b6044645050bf5e91f80e72e0a547ccbe7150611b430e4ee7fa7e. 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/BK44F2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72fb091ecda693809029a308b6767b31b937f7a83407734d99f3b680cc0c2ff. 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/BXG6R2400955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91dc4298474ed96c4fc7530f36fc5ff820e6278019337cbc57ed9b5ceb09829. 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/BX7P32301130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c68d43898b1b2daa28076a636379ac02c99892dd951c99ffff0165923b852d. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/BX7P32301088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6fb27319fbf57395e0b5599919bda588a1370b2357725c86e94b76d499474d. 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/BX7P32300964.