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 0x550c72a6711043962d5a7c1d0c59d923f155bd24448bde85823d3493ea35b3df. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8363a82c-96fe-442b-86e7-ed81c4b8d07f.json and https://artists.proofprofile.net/proofs/artist/8363a82c-96fe-442b-86e7-ed81c4b8d07f.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 0xa9125ae707d63173a6e54015d6c526b5a1fd308d66be02011611e9b8004ff5be. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NOCLC2301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04891d256cd7f838cbe0079c1cf6086546e91e31d8e6e9637a66ed1ad7c1aae. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NOCLC2302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f80af39b360adc7d8edc0582cc6232e5279f41408f4d3a00fb335ea42e26977. 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/NOCLC1701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14befe6ea567ce51e12017405cb09d17317dc227be2e9b49156b55c39cc0b87. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/NOCLC2303010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38807974ff02a38e1ca209c503d9bf2844e26be50f2af1f613cc5e102a4a77a. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/NOCLC2402050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b8d3e559906bb8ba75bab04e8a98346104a0fa2f026bbc34a2e033b389d005. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NOCLC2402060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea602cf74d1716d6ff948e359260304f6cdc4f290e5841902f290b7c279ff5c2. 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/NOCLC2402070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098e0cd439cbd62171fbdb8c662b4434eeee072e6c7aa6f2e35e95f240f2f0a2. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NOCLC2402080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a19b4f34ef4ea726252d1ecfa73fc0d472f737ba869253836a76828395f0152. 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/NOCLC2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a05e3c51bd11a8228e3e9a59ced12e6fc2a49c5cfe8022ec581a6aa22b8cd5b. 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/NOCLC2402100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1296c79393a6ed3d3e5e7aabc181ad4b687ecd8e221702c52947aa905fadf64b. 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/NOCLC1003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a4004b8c563d5e6adf17013d810be04a719406fcfc04ba5332d164053ab522. 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/NOCLC1003020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00df69a19e58f4d0be5c171250b3d05ebaa75a7a015866490f76189d909aa6e8. 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/NOCLC1003030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f10e2648007af805216902cf90975b54a39194272988593200643a4bb69c6e2. 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/NOCLC1003050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b1229042b49af6ddeec4dcc987f894e0b5891e05dcaa840b0f256884f4a9f3. 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/NOCLC1003120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be46d85e0005d55f07cb55ae1e45cb6f1e5318a04c1a6cce57072da6d9582d4. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/NOCLC1003140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4387f4ea91f6697725bfa90d787c1806cb658231b57b18615c262e35dc34bcd8. 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/NOCLC0501080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14befe6ea567ce51e12017405cb09d17317dc227be2e9b49156b55c39cc0b87. 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/NOCLC2303010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04891d256cd7f838cbe0079c1cf6086546e91e31d8e6e9637a66ed1ad7c1aae. 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/NOCLC2302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9125ae707d63173a6e54015d6c526b5a1fd308d66be02011611e9b8004ff5be. 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/NOCLC2301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434262e5ac2b8cd6766f42f413fd6cd169e4f4489c8e7c8a2cf55f04eb42bf26. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/NOCLC1602010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf7fd9af663c06ef635db18366ff442535783ac03c105cf5fd9a00ab4be743a. 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/NOCLC1601010.