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 0x3b99b18ac38cc23507b703db38b47a61fc410c1a63176d2e82ce59a34447dfe3. 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/9846d312-a109-4e34-af68-3b7b73d73e28.json and https://artists.proofprofile.net/proofs/artist/9846d312-a109-4e34-af68-3b7b73d73e28.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 0xafd641c221ea3e8071c0aa243a3b2313399fab0b7b243b8a11caf929ec330944. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/CZA168700785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64bb36c4f9e3c7bb55ce5fbb8f6f0f0bd324ede6df1c29e31dec5f7100a0505. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CZA168700789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a67905ce41ba990ddb50699d6972b14824e05d9fb08913a260086adc8273d83. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/CZA168700674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184221cd0e511f7ff659ec11b95a3f8f1202d15ccebd4a69f6234fc26e2eb86f. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/CZA168900533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b7ce73463615310871c85cf6432c174fca48a758502517cc1fa83ac6899817. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CZA168900539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61d8d731fcb6769c5f7ce7bfc4b8a7ebaae944c0962631c01d4eac5bbc2dcdf. 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/CZA168900547.
Jan Spálený... (Ještě Jednou Si Vrznout)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88f7d0904f7d3a6483bcdbba95a2ce8750c345f80e5f19754170bc1fc7c4053. 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/CZA231000815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73855f6b4278fef2f40e2dab15d272f06281a4ad2348f4f5ed8aba929a4dd9f. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/CZA168300654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33eeb3e50d6578287fb8432c96ceff1702be9df0e54140624a3c7ea6e2e949f. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/CZA168400675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e30d8c4c9481b5e01f62f514645f3fabfac451f04668c3090d843fa52f7b61. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CZA231800461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd15fba7185018cd52909ee317714c85b7f74ee800f1d883060883c5f411ff55. 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/CZA231800462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd329a3d98996e35bebb7cd0f5e5c212ab6c241e79df7eb7295a379bff5066d5d. 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/CZA231800463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b28a186a5886936bbca1a3e3956661a8bfcb9a45117795122cc5e6f941b40. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CZA231800464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df1f5a81f02f4d0baf1f181d91b57434cf8d18331dbbdc00f27835accc54978. 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/CZA231800465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92dcbdaadc48126d82cedd3a21fee92de174273c9dff6fdf03bd67ef027a3acb. 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/CZA231800466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a6288f142389d8f7e212df3100e523f2f8b3eef2f3914fcf34b5599cc05b2b. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CZA231800469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1980900c14b7ef6453371fd719893571bd21fd699e89d1189a8c279ea2ca3bf. 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/CZA231800470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3dbd647f948118fb3945a6a635536328a4c26f138211d83146334e6b1938e0. 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/CZA232200057.
Byl to hodnej chlap a jeho láska byla nenápadná
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73494822b4a02c81313942e28e645158381a90fcabc54a7a0c4f841f49c459d6. 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/CZA232200054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ad6cb5bd16b9ab370baca59236d111ad717a9ec1f041e320e9dc95e4da688e. 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/CZA232200047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ff45df3209a685cce39c024df6e5ccf0404c3c7e09404605fa63635c80fa0b. 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/CZA232200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c160c0b7ca468fd09e26a21a82cfa9e4895f4c33a3d634d0869100d300c654. 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/CZA232200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0b15ef1bf3c00ba1f574570d9dc8e7a57d1a505be213cf4d86fe65e4b72b92. 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/CZA166900891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f5f22afd90008af5181399d8a24cd74fa19c73b7f695d65ff7c58f9f18f751. 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/CZA166800393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598ca3ebd2ebf14588acdb9d99f3a3446d749d222a7c5978165c9ca1fcdf5a89. 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/CZA110102005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73855f6b4278fef2f40e2dab15d272f06281a4ad2348f4f5ed8aba929a4dd9f. 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/CZA168300654.