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 0x1635db0faa11da706d116af1e7868dd7cd9c2bfd67987eb4a955c8d4bc33a33c. 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/0cfb9cff-e45c-4e4d-a1d6-32bd006f3518.json and https://artists.proofprofile.net/proofs/artist/0cfb9cff-e45c-4e4d-a1d6-32bd006f3518.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 0x8178379c1a9bcb9d94bad1ed9ec683fbbba104fafd56485a6a0cc0f1e63e6849. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/USJE61303320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1ad169f9c4c10fbcd71199fcc539c5f1867ace57e6ccb3a6c3dcff09f7e10d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USJE61303306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10553cdfd78bdc2c1c8d49289690e07e140a2b609fa5acf01cdaf65f5aef5ee. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USJE61303307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63abc160d6e0afe96d8dfa22e5fe595cf8c77c46e9d6af8c94f9b964b0ddf7b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USJE61303308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf536e8e50b82cc281e6570efcf01670f873b6c95e7aa0c1fbdfb750952c283. 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/USJE61303309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659e9fa05f7b0280e9bdcc6ed9b60ae8386fc6bcb06b912cedf3866a128134a8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USJE61303310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1925d46694ae8d0401f245e8d96489dd2a2964f538d20b95fa48fc90bb3a84. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USJE61303311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e9f660855077de35b59a7be749c8ebabcf7a3e3a1757d7301b983e2a570c46. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USJE61303312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30545d2fbc670da7964a9e3090f9c52462fbb5ad7a113505d33f47230cfe34f. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/USJE61303313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85dcdf6efcc7d7fb5c5f51780bd86305f805442c27c809186a1f73d777319e5e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USJE61303314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4633114e9a2b1b483dd13242ecab509d169e7a2c4219611c9a21ef7c26a8aac. 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/USJE61303315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92fb27f523979d9476078f3f2b9eb4ad890cef52c22bd7cf48e91122df5ead7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USJE61303316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9205de4905b153473a0aa72a26aabd37774e07a4424aaeb863ddca789ff3e8de. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USJE61303317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebea9fa7aeb594bdf4cdfe82aa5835f18aee1fadbad418f5bf9042279381703. 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/USJE61303318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c85ddbcd39dcb811d3bda26a167e4d345677d6b2defb14779b9af64880746e4. 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/USJE61303319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87cd12da447ffa0a76f321d2c23f06ef62c7a642df234b588f8f6a2dcbd9953. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USJE61303305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109f5ec593c4f746b96f20752fa18c3322ae3c8279d9626bff30ebd1316cc90c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZMBZ0490002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f75924496661a6c71a89b4d4ec0897cc2dab2d99b0d6c21d5112e58acad0844. 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/QZMBZ0490003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19788b02dd7617345b74910d7433bbe7f5f7f4904813a6d9056812f827c15ce. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QZMBZ0490004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63abc160d6e0afe96d8dfa22e5fe595cf8c77c46e9d6af8c94f9b964b0ddf7b. 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/USJE61303308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f6174d565606a9defcb8c5305fdf5706187380d7f96c68d178de8faf279e09. 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/QZMBZ0490005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10553cdfd78bdc2c1c8d49289690e07e140a2b609fa5acf01cdaf65f5aef5ee. 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/USJE61303307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89e3f4477b8eb203501c3d64b748e60aa91185f68cc67912f6df84f00dca8f2. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZMBZ0490006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a0bdb2de27314d31804d4028c62ea5c83e8e8c1deba12f21358a531cf427f0. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZMBZ0490007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42fa393ebc6adce9db0105ff8c5128ae76f4c6df63a6fa66bc890470afbe68b. 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/QZMBZ0490008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1925d46694ae8d0401f245e8d96489dd2a2964f538d20b95fa48fc90bb3a84. 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/USJE61303311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4633114e9a2b1b483dd13242ecab509d169e7a2c4219611c9a21ef7c26a8aac. 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/USJE61303315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85dcdf6efcc7d7fb5c5f51780bd86305f805442c27c809186a1f73d777319e5e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USJE61303314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92fb27f523979d9476078f3f2b9eb4ad890cef52c22bd7cf48e91122df5ead7. 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/USJE61303316.