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 0xc4d502cf045194605fc48ce264020269b2d9a190c5ed2971e416fb8817efca94. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea035daf-d197-46ab-958c-093a2a037402.json and https://artists.proofprofile.net/proofs/artist/ea035daf-d197-46ab-958c-093a2a037402.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 0x912b94d8a757392be31c0a7a9fc37f8dfe16ba81cce588b7c525b8bb7e86942a. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZK6J2475624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2415e6a91999421221c33ce2c3b7fe289ee6a9a65aaf49cc0ccae25a19f63115. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZNWY2452370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b838edb8be47bb8b41188f88e274aac8d041b504060f8a43ec866bf9504bc5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTAU2411492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b7c001a0d38c92039f6805a23e44eccb4b2065d7b3ef1e26f66e7b5f39c215. 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/QZTAU2411493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2415e6a91999421221c33ce2c3b7fe289ee6a9a65aaf49cc0ccae25a19f63115. Chain 2 (Bitcoin): anchored in block 957705 (2026-07-12T12:50:42Z), 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/QZNWY2452370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddbe355ba7b0fe7958b51e2b6508b7de9a2f9c72e8a11fe15f290dd53d4328bb. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTAU2411494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd8b2dcb050bcc313dd32cb6dc5d36d3bd6c13260b9ceeb5562ee0e1966c671. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTAU2411495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193959543320481af790a9116e7b21c36071cce294496913585d2056177314d1. 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/QZTAU2411496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61b01b5c6e765bf85f9522611bddc6e67fe3b7e84bac95995412a9f016fc2bc. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZTAU2411497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b866e4df6fcf2319db8a48a1cba0e5b686ca96b410e29dff3dba87235502b4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTAU2411498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21e2bc6f9c807c02fa12ae6ebd87293b043e307cc89568d455677c73c446053. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZTAU2411499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8f0215f93a85ef92b1f14a1a50eeed7c5bf04667266fd98cb236e52bd1ff5d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAU2411500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91322707784c6b360a1cf6c82150f93d3698f8b84001202beecdebc8e0b87a54. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZMEP2564609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f7ee360ad2bdb1abcee094bca61126df92c137ee62aee79eaa9e06ff119529. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZTBB2599258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1847c502b22a620aaf6929fdf4d1fb717019347d1f8887a436f684993eb8d75. 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/TCAIV2478968.