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 0xfe910784ee53527e1fdca8a6382f557c885d7c9f6546496766252780f733cf62. 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/e583a18a-de93-4b57-a6a3-6e3f87f0bf88.json and https://artists.proofprofile.net/proofs/artist/e583a18a-de93-4b57-a6a3-6e3f87f0bf88.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 0x36c9a499b5e74414e875738273eed96ba2e9f956fc0410641be5bf1f95225300. 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/QZDA82320268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875362cabf9dd90114a9c0ed510ccc3def50d6208d40ae1cd88c959149165745. 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/QZDA82320269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6d985ddd5b92249224fa43a705750a2fc7132dfe64e57fdf700d61ac228078. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZDA82320270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a722dc4f6a56040253ce0c6c9993be43068a75f7bb6d4c3740e015c8859821. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA82320271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6b8f06aa8f669206637732b608a9ecafc3758dc07dc04a015fd0b737e17bb1. 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/QZDA82320272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf121a886aa9d5c97bcd4724d6b6129821af86ee09ccd7e67368509c36c8ef0a9. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZK6L2333532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e98bb123622ad2c57feccce63bf05b3e6a02dd56d83391d05a5964d7480177. 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/QZTB62370373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6574009a0912b493728da2038ba0fed87919eda42075b4ebace7f1d4160e942. 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/QZWFH2352054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8ca77f772878465308eb74876baecd19eb67809bb2236b316a31eb5226a2d5. 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/QZK6M2479520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa41728dd3e7f340922aed6e6deb5f99094e98620a55f8eb9243d942a799f96. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTBC2425130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a68e5fb51de9c9560e955e8cd83e6dd60a7f85c91f23e4b8443ffa73f8128c. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZHN82548325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51d0353ddaa66d3ba899cf37f86c7d4a5c48bf499620e11769dabcc38ff24c9. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZHN82548329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc631f573c7a28344673528bbdb9ef90979637939bedeca11462dfb6167eee7a. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZHN82548331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f13d98e3e21dedbb72c3591be678b16400424d03e7f60089435425219fbbb54. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZHN82548327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f14a3617f87a19dba83ac9c9fe40595bce9c3f4767e8de8bf35d81fdcaeb0a2. 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/QZNWR2541686.