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 0xc6532d24297e5f119573183ccdf19f09009cdcce64232d8b379318d9bf88bd0c. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9842c0f6-78bf-4ba6-b8c1-3dbe83af8367.json and https://artists.proofprofile.net/proofs/artist/9842c0f6-78bf-4ba6-b8c1-3dbe83af8367.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 0x78ca8daa9fea1f91ad0a503d1e9a233c9285f21fc79ac6b8173925f8dd5725fb. 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/QM4TW2472322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2629854ed301403792cc6b90b8bcfe2a9d95c78792a2f9c3a0656a22e5bcd1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QM4TW2472325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfb7e9c2b406670cfc97e58eac9687851d75fc215df2d13d01f4706b8420b7a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QM4TW2472331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacb20e28840170bdb520da02abed776fdbf25bcd6ed16c2afda6413edb3e9de. 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/QM4TW2472319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6307253e87c8ee8a75354a2c8c7d356fd9ee42551109472164074a73c7001c52. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QMBZ92256593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2107a1e743d86507dd2fef7af870a7e9a0b1f65b035b5b06bfe719068dfc8350. 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/QMBZ92256598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902d0cb8a2707aab9a8a2d16244880ab859dd503c82126e92ad2067f8bde0359. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QMBZ92256599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e224630a945e357f89e462aef43f5721e402e693effce9c1b63f6e49b07575. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QMBZ92256604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92226fb8af318b1adbb30e8ea93139c18a724507ac5f024eec2d16fd10c3ddc. 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/QM6N22295579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde89ab5780e8fcbd27e13d4cd8174f30a59debf01de0e6cc307573b3cd825bed. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM6N22295595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b87afd4b89834cff4ce440ae2209a8fd701b22b104a73fe57466c143f8c208. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QM4TX1994723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd395081233d60b30b7b79779308d9cf2487ff121aab4400f8d6300e8e65321e. 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/QM4TX1994729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe91b29655f3477246c77516593a3ad839ba07a1d45125ee91314924913b4932. 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/QM4TX1994734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aec8a6a268086ac3eee4d97a2e08e09a56228f5502340505ee2d1a93c7021a4. 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/DKMV61904301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6374adc8b4cd33b5008f31439747f4711591e5dce7b5a8a304cea1ce492465db. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DKMV61904305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861e5dd9c21f563a21484a2deaa931bf32c03aa04748c78f219b211636ff9c08. 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/DKMV61904308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06537e0624a4c10df09b10e7feb0ce1f9a29e5f7289f3e6307acc9fa2b09a80b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DKMV61904311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7955e084c41bae8ee3b0f1a05a48f53cf62556fc4843c34cbb3d1a8fb461f5. 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/DKMV61904313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ae5c47fbda7304c7e4bd46afbf4ac590ec76d4e905a01d8fead0414c750fa1. 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/QMFMG2330681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45491eaf88783da10a7781cb24ab55246c1bf066a377f7bafb297b50a93d5d24. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QMFMG2330683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cb45258ad814da7bffe7b001e15756eaf52631d92ab224e594cc41e2c1030d. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QMFMG2330684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e4e872a0ec821e3a610ed5ff2698f1481be22b4f4dfae0e16cf3bb40d8fbfc. 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/QMFMG2330689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e60ce9ab4adebb26926e58cd3e475a3d2abda8d3d798df1d6eed06a6a0b6a7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DKBG42200701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa858846fce23d5a65ad1f7177afa23b2bca31d1e02da35d2d74cb1cbeecf59cf. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DKBG42200702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ba622a7656b447919243dcada0a40b8cc71c78d6d4f437d004d697f0267f63. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DKBG42200703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b04b7cb0851e3c71c1ad1ffec2d8b7cb7440083b0e99c4cc5c30caa27504e8. 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/DKBG42200704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b7b29efa4ae631e3e9e7082da2c89fd648ff7ea956617c465c89347e9637bb. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DKBG42200707.