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 0xea7fb0d08a673010cc700a3e9b1a6eb79d938bb35fdbfb0e29d733a76b72c391. 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/8eabbb94-a65b-4422-baf4-d6b2a62dc3b7.json and https://artists.proofprofile.net/proofs/artist/8eabbb94-a65b-4422-baf4-d6b2a62dc3b7.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 0xb7e7d8abc92e3d707bab19bdc7a132fd2f2c7910cd7f406a3d9ef52ee6c57655. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZHN61958802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2dc19db4172c1cfcefb1b9c00110922e9be9bc7c46213ec6fea2d588e141c2. 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/QZK6Q2330995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd19c13e5a64c35367eec5a8a7ba406232e0b0f53c5011b1ffcfc8c7fe242637. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZNWQ2340480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78b482ce4c11ff44b66ec60f643c2d031a9eec67af530d663ed5eaa121403ec. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWQ2341854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32265ce14ce669ec5cb79ed48a23174c63998ee0331ce9b72ba32bec7a0f6ccb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZPLS2311981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd8a965d410cc41e86c4024666083b704006c8bcce28508083d6159e563a7e2. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/USLD91752816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db7d71bb3844089d079872564b2f1ed9d47eee082b3463c7f334e557fdb8f1d. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USLD91752817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362fe8a976920bd99de3791e8ea50ee3d31278b96689570d2477e6cd10d3e7b7. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/USLD91756461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a3be950fc356b5d431d1acb26eb2d9cb96d0218121607fa47b2a6201c9d833. 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/USLD91757346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a422c31f4cbfdab8317bbc5a34921688307a0959ef10230c51de65b033eb3c. 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/USLD91758775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721eea2394c9810bb7eafae99bf5baee810425f2e73d011624a1041dd1d7da15. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USLD91759047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8935aaaacc5c0b6900ae67d8c5a28c66c357e662ae60859f6238c96cf0a131ec. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USLD91759049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a05d48b6bb188b982c01649c93c5e48fccadcb66d4f6424e27bb117c9d0f721. 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/USLD91759051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5f9e11ebe1bd371fbb3bd3389fd16d1adb1e2b8782064da60ef7658f64692c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZZ7V2492330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557935c801ab72ab5194998e067ad18f8622667d50e1efd2bc7e4631f067674d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMEM2538002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d436c37ea3ea9781880cf7545d4056140898138ea77025e293a1465a4c4e1ca. 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/QZTBA2539710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e09c686fefe96d539eaad5d08181a962ac785c3e46f75b726022e5718c1c7a6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFW2535880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a55e22c6d59a9730ff7a5d50eba809618f57995528b7a7c5def2876051788b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7M2552650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0978f348ec7a029a7a9d85055ee57ae9696aff1e4be3eefb6ba489d5e0abe9c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3F32568004.