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 0xd5756602c8a05eea7b9bf5ea0d1bce4f4d3049a0c753c362ddd6c097934dceac. 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/ea743886-7c57-4771-aed2-9d93f4970aed.json and https://artists.proofprofile.net/proofs/artist/ea743886-7c57-4771-aed2-9d93f4970aed.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 0xbc92ea2544a0dc5326a9dbe3619dc89db16d46b682a4b903e6573ede0c24c2d2. 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/NL8RL2436757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a2c1176fd272809571d23c0a8c7e3842e48f6c9a2042456d4dbb9078886296. 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/TWDL72206278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6aad3927cb12cb546c5e00ee3b99779cdae57151a40a86b43dfd8f84cba3e6. 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/FRX282359504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36434d1ba672b2fbc781562d51ab3d4deed29d9fb33dcac87197929b853e34a. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRX282359506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0f10c6562544e2fd36379399dd7c9f2115cbecf11e1cb7e2ef8c8dc7699d0a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HKE022200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce7e6d8b4d5fc06f84a819ded92946efa88adce263c5b642103d9cba6b58f51. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/FRX452334623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789576a7b73a070a76c78d7657dfb405752447f448d7732b2e78b0180fe98e89. 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/FRX452334625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae25b6cdc50da5a332cafa86a7af8d7f8501c4862a2e664915550554a17a0d5. 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/FRX282361385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1a316d023bf6b72de389d55d27400387c0e03fb5dc973ec47a5cfd88be76ab. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/FRX452356341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1fe1ec5f3dee7abbabaa2639509fa308da867db12ce4da49699b1425b6fb17. 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/HKG732228428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4cc3a408fae6910438027dd79529a3b4db694a547a12133f898f712e8d1dc6. 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/HKG732228430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7992ff901cf6ee1773e99475bf2312e101c8c55f6229ff0c1bebdf68961e649. 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/CNZ632200380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0b13e97c1647059746a3517c7e1c7ead5ec3a86b9c8669e868558bf33609f8. 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/CNZ632200417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb362ae833f95e929585230298243557e956286739266c74666b0214c77fb00a8. 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/HKG731785807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c9cda6770fecd9b31bb70c95144b788c1a0532c6e370e103ae1780cd46c52f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKG731751468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062c3a63b21c155438ca063def29b9feddcac8cd1417db4f6712ad0b186030a0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKG731743899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde96b1a3821b71374c72f23fb005b43784154f515dda94ccc9d8c084582144a4. 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/HKG732290582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61611ba38606733526ad2070893664a20c0794ef9e1faf0a3dce78c13af12271. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FRX202280262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255c78c3ce0069d19ff775e59f5f8bba996fb1fc61bbb91dfa7d8afc2796d998. 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/HKG732125830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa2837a141ad7751a275f872ce8e25a9c45f6b4c5634a8c747cadc15a9d9052. 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/HKG732125831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6819ffe0b8f94b1ab71ed066a6b46eca3d35e430f3bfe84217e5340338d5ef2. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/HKG732419097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcaa07d5f4f4c9215fe5e8b6b75c27a3766367e6572f08bbf81e64a1ee9ce5a9. 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/HKG732105080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43adad6b357cbc15be2b7a34d7105f7d66bc369080cf2aa2acee0e8a7f56b827. 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/HKG732105081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f937ab2049c1d38041faede8b6d147762fc820605b8818f001c23caf42dbdcd. 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/HKG732030449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c92ae8ff7177c1ed9cb4a4ab0368e06c0d09e81fc524e07c498267d4f22429c. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/HKC992724508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8df018c78b96c5481f3eac481e112aa06565a77e568f4c5f0b53a760002290. 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/HKD012366626.