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 0xb30e830852394d3642edfdcddb6e1749356bee1a73bb0f91baeb2a5239f6f14e. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e32f53d5-4628-42a8-9955-cec1e0122e2f.json and https://artists.proofprofile.net/proofs/artist/e32f53d5-4628-42a8-9955-cec1e0122e2f.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 0xc5e556f0a517ad4a78908eb6132f931132ddecb8c0bd599b1d661a83bca5be2e. 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/QZNWU2565312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b95450e9b94b8dbd3224906271c08dd8559efa7827f075b75cc893e57db4ba. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZNWX2543467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da75ce2673afd05aea2db7d87032025fed0edf2d9333d1c5f337cb10c85a224. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNWY2505859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489a20b640f8538de6f512510c59e826402a741ad54b0196277e42fb2043cc0f. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZNWY2505858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc150abed935f718f7189e1a22e0996f1c742d47398a2dbeab5c658a758a84749. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZNWY2505860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5e9898ae649ee66c597cd12ba79dbe6c14c6f65e339048c2c57d60cf16eff4. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNWX2599307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8747c61ec7448f6c8e9303c8cf6dd10061d4b488224066b1cf3a82704b8dff. 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/QZNWX2597002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc852fb9fd83222d5d40a385d6b0d31f9cdb051d8b55fb27b6ef14c0d6bb37aa0. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZNWZ2534052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00efd9926608d73804429c97dbe63fe5a2d90ac8b0aa4cd5170b0cc1b1a744ed. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZNWZ2534050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf180d101b684ec38857b026a78013894567a0bd77737e5145b8149b32087e38. 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/QZNWZ2535889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e94034b969f73e6ee016e76c2e6e3b7bdf6bc63878d04a1c7aeee6021cc8f4. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWZ2535885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd548b2a8293604f43fb91ec09a0c7f5380f41950bd9b97a2e942bfb566b8cd56. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZNWZ2535892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92fc44878a19b4b2bbe3c1d1c9ab540b3d979070c26865ab794b3c8446e4dfc. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZNWZ2535887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5570bece55564e4865e8a3691cd78fb2b1bfe3ca3e2f2003c7d6292f81e87ed7. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZNWZ2535886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b9990a27edbf9d0482564f7ca5f57cf0de3a05bd7197d0640fb3ba7537cab6. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZNWZ2535891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd675e38a2a9ebb1c32f0ffecb6f71dcecb8208ad12416b30d5e0e20fd9d4a986. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZNWZ2534045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7f6dbd4a25c6f65a5f1ac440510a36b60d7a1c5d6b533acdc256a271afc51f. 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/QZNWZ2535888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6302e3e1fb18f3f023b436c41be47a59c4889fa6d7d08dd1184026a8dc68783b. 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/QZNWZ2535911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca713175761645deeb26aef90ff1be90c78d19eabc86503499fdaf25a56abc1. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZNWZ2535895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745b03ee94add06acbf3b076b7bb703f18f9e1b74e5649018de6cafa679f3701. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZNWZ2535910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213060dc3397d3a2a560a8a2d90c7d980ee61ec609f01238a9c8f19cf0a758a4. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/QZNWZ2535908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c79bc6b99a1a58ea6aa3b86a794a7c158b7a496c7c69d2a1b2fb2df77c74615. 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/QZNWZ2535909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff36107f90722c6deddd0167f2d3ce0c87cb50b5f7fc58713d1f2be282e1d050. 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/QZNWZ2511717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fb2fda28f6d8d9122e3061e39e466631709e2b39de35a090aa5e56d78d0e89. 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/QZNWZ2535894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefcf03747d77c520abbec28e2fc87b7e93cf647c92bb8caf3bb7eeb23ec3ebc4. 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/QZNWZ2535912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a4747d431d610407a1f59651a9a552c8c306bbc13b14560a9b6fd136993335. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZNWZ2535906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc333490b24e7f936073e74286620f8563617db1cca3484423d2681923ab30f. 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/QZNWZ2535907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5dd396297a53a695f31af00cb75accd2cf4c26dbf7433d6c212aad9bb24d19. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZNWZ2535913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc562ef574a4b8e100eb15f1d541f4a76550855c2accc201f4b3f877e9e6f64b7. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZPLR2595479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7b86bbc61d72f34ab005a4df10efb5b22576f25f4627b46562011dca27af8d. 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/QZPLR2593335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4dbbb06919fed82091284ac9e310dd071a349bba2ea0aa2e56ff7e8bba9c6d. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZPLR2595491.