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 0x07b5c4bdac518dc847de386fc54f13e2659e2490e422aa24ce192cc4d88ed5e1. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1e478dd-a34a-40e3-a1df-bc27faebc82c.json and https://artists.proofprofile.net/proofs/artist/c1e478dd-a34a-40e3-a1df-bc27faebc82c.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 0x4dc44a3c921488ae6cbb848a7ff7b9e4f042bd59d2852e1e1a31fb88bcc8acb0. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZHN82414518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cac13f6c2e60158bdec4c5173fc98b41eaa0d153e811c8bbce34a4391824ef. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZHNC2438147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267e81289d58b79fd2dbe019294297741a4830e49ed1ab1058dde627170dd127. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZK6J2460085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2770bc3a8ebf67e9e3d406b7b7bbbff4ff0dda55726d96cc57e1409a4f1125e3. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZTB32479250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51af3272ae5152f5864ab046581e2e08e952d105d949ce3c55eb5e72097d3a0. 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/QZWFF2443927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafdf3f6a8ebccda7e81b0801482c249defcda8678638d0ed613332c4418072d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZWFG2467373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cda6dcc51008b38566a9d0caa528447cdf6bf2df5616377cccd9cd80695feb2. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZWFQ2497618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140cb772635f2dd4c86b675a0c0d9616f3e9326e649d0d7e2b971c2d9053b64b. 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/QZFZ32588271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d864daeb5c53301c8ac3348e5422c831d9ecc71a5c336c3773d2d9c5579df0c. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZES52510538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ac6aff6ef5acc78c2bd351c00b1895422e7322937b707d6b0200c89b627b76. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZK6J2573384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe929b4682dd862e1e254d3292091aaaba0bb25a52675cccb6e9a9dc76c55e144. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZK6F2599668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdea8fa945674a6d23d865e0a2f437a7b858683fb62029e85c6b7a152a9563a7. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZMEQ2521006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845c7c70e84fde9717f8c870114b2d5126030f24b6e8114dbc8be073e725f997. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZNWQ2524200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb532abb89dcf943b9365445db84fd90c18100e1429ec903bf96d90ed94acf337. 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/QZNWU2527499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0eb1c39e422190cc13ef76f2a162a20e1381b2b04e8f42ac012dec758fb5b54. 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/QZPLR2598271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c29f79163eb06b157e24e574ac9fdf505da5ec05bf3c1865fd0570f6e4045a. 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/QZTB52533768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ab99f3e3ccf8900a2a8e71456b1173c1489bc4a71af248300dff5c526ad060. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ7U2522150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d46da47ff17db81e5f2a3c316f84898dc288ffdb94990161c41aa05527eea2. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QT3F32518569.