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 0x6ea0f67029e40af4ff51822856ea110b8c32e783318c79cc53a5a9dd832d5d8d. 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/ea7da3b6-9739-4462-aa09-1513fbd58d75.json and https://artists.proofprofile.net/proofs/artist/ea7da3b6-9739-4462-aa09-1513fbd58d75.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 0x658d33d15c2cf684d04b72c1cb0b555c9b52a3a6f225834d033f561b9a668d89. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLB170801788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc20b7d428cbf1de24b577f1f406c768e39c77cfc393fc2fe54061a8fa15cf8. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PLA140224013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791e2c5337085362f2fc040392e6c22f3cdbae50f267a21bad869ffa322ca2fa. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/PLA140224017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a091511217e28a88b2c9dc0954720e942051aeb394317333ec484f561e481d. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/PLA140016002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ca78badebdfd6e84b8a3ebc0b61653868dc96e2537daab4ce3cc0a506b8ff6. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/PLA140016006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76a2821ab32eddb2ae127a9593296d57d2a95356cf5f972101be6327b791c69. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/PLA140016008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea1ffb9a1c8cf8ad9ced7a9cc54c57db0bc0f2777f5fd3c616079760362dc62. 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/PLA290700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8e1b2db1f9bf0ef10ba447ba101564b5f5c7eda98e51c102be3ee679f7c272. 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/PLA290700022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84d817d63f0aa2c7245460b90892a77dc5305f38a4b7324f01a070dc9d1f62e. 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/PLA290800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3629698c4f5988018b165a659cc9699789d245733d9d7e77e74754be80fc0eb1. 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/PLA551100504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c18bfff5dbf16a336550e9575f2369ac6f8e1dad40318c28ae65ea841adb8f. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/PLA551500298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6689ffaa264eb7dd576c409001f339dd02221fd541e19c149814b8e476be3c16. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/PLA551500308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8736feffd3789115360bb91a0452eee112f12d6dbdacf871f066e1dfa07966. 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/PLA552300147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9db21d692a0aabf037b2321f45e81cd4954b17d521b48b9815d4a1ebfe5f99e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/PLC281200018.
Przegląd Piosenki Aktorskiej we Wrocławiu
Laureaci Przeglądu Piosenki Aktorskiej we Wrocławiu 1976-2019 (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83570ae83ec4caf475eebc80d605937a04f8afffc8bbe1b2fe21919a2feb9d84. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PLA291800143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d86b6edfbc8213a41f98816bd1a34a061bb3756766ffb08f907d4b60e6ea40. 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/PLH400000025.
Kronika 30. Przeglądu Piosenki Aktorskiej
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6d6195eccf6cee6bec1cf93a4adaf5c747ccefa0d01f05a3545bcea4b0a849. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PLA290900168.
Kronika 20. Przeglądu Piosenki Aktorskiej (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0896b632cc9d5293249feb182b9e657aad8281738b9e5795d88bdd0f23413338. 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/PLA292400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac6731a66b7a79e341976ba527802936934745eaa460f230fad303dc4cc7c6b. 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/PLA391820413.
Niedziela na Głównym - Piosenki Wojciecha Młynarskiego (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e541cce098186e2ceb1de394851aa790193729d877a966e39a35081f88c222e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLA291100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1dc6e5212db43f8c1e489d5568261b119585090d98954f2df0ba94e90ee65fc. 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/PLB171600258.