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 0xa786e22dcad406cb016762ab735e0160c5763939fd47a7e172b0d2d4389ee412. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33dfcf44-35f9-40b9-8fad-23eb505fbc26.json and https://artists.proofprofile.net/proofs/artist/33dfcf44-35f9-40b9-8fad-23eb505fbc26.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 0x22a9b130632df7579bfc66b90b914be17011ba5f68b99ce4c7a8feb2fbf256e6. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLCK42225277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdada601f0c0ff581fae640f9529747708186391079a32019cf60e5ad0c8bf9bb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK42232106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57b4dab1b4ba6940b8776c90907296a5425d1094c98405d3c32e33b84a37b52. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLCK42232108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267649970c2fd617752d65c988498a3263ddade332d90348d3385afff38cfa47. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCK42232109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d4fb6a85dab976a03ed78db005580d766ee0974ad79ad334a02b9ada395cc1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCK42232113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a4a087104809e47f6dcf2bee809a32839618bec2b3c8beb20546b7acb493b9. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/NLCK42232114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db2fa9add0b72f969423076250a6ccbafd5877cc0142c34220cc0ee1b342e06. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLCK42404234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc271947681395856ca26617adcd5b1de73686e1fa6089a689363c9bb266459. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NLCK41099462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d492037c779871e4c48e76250c7904b682ddda3320041b8cbcf94557f562e2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCK41096046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69f6596bc7a65fb8bd8dfef889731da1dd00ce00ffc6129ac2faaef04178849. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLCK41096047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dd3d5acdbf5d727d01dc869b1a2aa61d3794c27ba50f88b8330df3b913e623. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCK41096048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f8560b7121e0cc9a124c60ffced12e31641f307b12710578c5a3f8c92559e1. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLCK41096049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d31b1e1a3ed6e98ae27b5301bc4a4d26ed9a84178157f89030ac328bf554db. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLCK41083219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc6d0915ea23640898a8c1e33a08801b87ae7ac025f3f5b27984b6185fa7ae3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLCK41071094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43527a1cc697caa8bbf8746a7f675bdf112cb4938f311832af18b24ac7792204. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLCK41064778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecf5784f98982095ad46b926446653628ff6f8daaeffba9decf14450247320d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK41064779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac50d424453dccbdc7e7a2215629afecac24be38c395dd734edf5d42768516e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK41064780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d29b3b561a321682db1062e35fcb7807779b59b0efcb22447f426f857dfc3d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLCK41058726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a855a6638a032d44059df2a4fccabc5aecab4b2c3a1617f40c4d576549d9a3b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLCK41058728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab0f455c6ac7777b59b76c8f38c701234b11b1aca4323d6cabb82a1e1c77d7f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLCK41053094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ee630b179a571a10321fa0a57553cf9018e667e796fbe9df727121d23ee457. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLCK41053095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d40da80d59e119d76a9e756397f71f75cff98945845f779d9ec0e513d00384. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK41053097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1cc18d54623f651911fe11a5aeccc729f3d7acf9ce12dd259ce05e307c9709. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLCK41051227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6235dc3f33b281766b00711094e2c879f569b49f27b0701ccc1281912700b8. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NLCK41051228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492a1022f477f73ffb3e5f51b87a4663e940e15724c2964a30bc993db0fc3606. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NLCK41047721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ff97c38dc5edf69e080e0e0e99e0720dc39ce70ecc9e84f972ca24719a00ce. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/NLCK41047724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89260ffbff58b34f2175c5bdf9d18992da88911e3ea0079bceabc51ce3b21261. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLCK41050111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c6f6d9c8b17eaf0a077cd1e3a01ac6efad5f7e13c41002cf74967a530fcec2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBLV61522872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99cb2c9fba1fbc49eb45402dd760620b18d232741506bffe83f07b032202909. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBCEQ2200049.