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 0x2785595b01eb4291bb448d555245083cc2eeb61a618305dcbc57b1369691d34f. 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/c5e50328-65c6-46f8-adc0-fe11f3c580b9.json and https://artists.proofprofile.net/proofs/artist/c5e50328-65c6-46f8-adc0-fe11f3c580b9.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 0xdc88ca2c2d50c75b6c4292c9ef0051f4e16322d73a9421be711bf944ffeb5b36. 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/QZNWX2484348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edb90a3358be86334d3aba7a3f5ca9930f0163ad066ab70a723f81caf7e0539. 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/QZNWX2484350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e8042886b069c0e7d6c8b7ba853656dd7273d609a39016bc996cf97674adb2. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZNWX2484352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64e50fa6faaf6f094580f3dc50ad07f49f91cfb41aad7ff8c410131cf4d9d84. 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/QZNWX2484354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf09e50b8c8f0f5745b50e750e8bd5eddf7567f69d70b6ba5e49f6405224b30. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNWX2484356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee44030002a76cbff6d9a319e9cf7449e65b8af234e787ec432b48fc72cc696. 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/QZNWX2484362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546d107e2a6fdf67836407515a1719bb4e14bf6effd26e960127d98f6200872e. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZNWX2484365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976f90d53e220ca79f0e410b3a28a52b35878bdf8bf4168120a7772597525643. 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/ITH711900081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa47838f796c7d9a8b7cd111619b6d66266e20877f850a8978dbef135ebff1c. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/US3X52144802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc74199e439ae09dc407e8018c89b748e0daaa54f042dee84f7d80a263e5201. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/ITH712100169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b787f757b48fe28f5de24b8da3d935f6e4399c2266b5f01fd1b7d08e4ea4558. 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/ITH712100167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd62f98d545adc7bb845f8117d4c910ce6e0d6e4bdc9741d33b206bfd9c8ab42. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/ITH712100170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f8c78621f5ad0d5944422e54c53393b9d031a770ceb6e87c95e1dfa1d29d5e. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ITH712100171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b32e1fc1ede89e9d1c67bb7d8d85f77c8fe384898cca04951c18457a8a4393. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/ITH712100172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb166cb2a6420b1e32e44508db49a817fe3c9bc5173402aed8552e3afd43919b2. 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/ITH712100173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e1ee0dc73c4d9762b36ad48d573ac2b874464bb8cf80dfc8752b996d6a7817. 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/ITH712100174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56b7b4f9cf6ee4475c7115439a350f934318aa16961b474fc7e2586a824b822. 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/ITH712100175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11a1af103aa10de2f50fc54ecbfae1ba8e98267b23b496a28272bd86c068aea. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/ITH712100176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c05ad3079f94f9740931fd71d00d7fda7efd496c1bbae9482f30f6fab030c0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ITH712100177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c25fd1faffd50341b11775f0569667f79ea0d985d8e2f82c3c26599ff34bea6. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/US3X52144805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24302faf5f83887cea4e8bb22ba0d95f68b98c275431a3f47f8b0fe3aeec7fc5. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/US3X52144808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7947071cb234c827b02991fcdc0a3c5ebc2d5fa4584849c65512c9dbc6afcb. 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/US3X52144809.