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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c6f080c27569852c3172f222859dce2e54508341aef9d38cf5c9a2a0f49a1c. 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/7ee2250f-03c4-40a4-a238-2516b190c3b5.json and https://artists.proofprofile.net/proofs/artist/7ee2250f-03c4-40a4-a238-2516b190c3b5.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73c96c189c5901e46fc60dddc521cdf678eac28e397548562a52e5e2cc2ca1e. 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/CZA230600500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dcf03e53e6c309d7f3c4a169c7cda7bf1bee6ef41551e04aeef7fd33d8a7fb. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/CZA231100689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329f493678b55f0d6f3f16a153976159aa30e61aab6f203f5f873c90c237eba1. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:43:33Z), 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/CZA231100691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8dd7f827c606b1b62848106de44f3d5d2ed55d6b24e166007b7747d8b3a317. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZA231100694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2073af896693d326bb970f0680bb06f47c7a2585a11813aeee0323c705cbcf7f. 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/SKE322500102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f51e6e4b3dce424b6a39b3c7462074d9b61ccf1b4935bcd8d3e9c2d49c3c56f. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CZA231203654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3065ef55f005abe2e7c3a248e0a06adc8b8e023fb3ef8bd185ed4d84d2d919b2. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZN882073891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d833e7e01a920e8671e62f04eaa1d6635c490a7aa9b9846824a28048006f92b. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZN882073895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019c8f032dfbd070775ff6869a0f4f688025a7ad07998d40b870755acd1ebe54. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZN882073896.
Jedno ráno (Titulná pieseň k filmu Známi Neznámi)
Jedno ráno (titulní píseň z filmu Známí Neznámí)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e5253f80123c12f2f31927e2aaf6ef11c2299c9356283a320b81128b93c562. 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/USJ3V1341977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2f725ac779d17ba84cb7051c87aa8b776751ea22ff971baf0748d1c52708b0. 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/QZZ662348200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64be0ab3e4416b49f2f2cb462f927c7985b6cb8b9589f7bd30c743344e79e1fc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USHM91827334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc884b522a640adb8cc6ae25d8ae4565bfd4352cb6d440e33b769b21cd15e44. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USHM91827338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9657faae5237956567d5ee651f9e72aca18ba87969bbd3b2878327413d683a07. 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/SKG671400203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a01276f927a492a4c429acbf0e54bd0d3c8f4225ed0df7fce6982fd29d9b40. 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/SKG671400216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd823b82d9a66e736bb1cb2318fdff57321856dd625584ad7ff48fcf7a0700644. 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/SKG671700208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e5253f80123c12f2f31927e2aaf6ef11c2299c9356283a320b81128b93c562. 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/USJ3V1341977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b52d64d116b550b575050b39136ad3a70ef6588a2e9f5ec5d4c476ec85772f. 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/QZNWW2110396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180a1c6b612992767b5251061df7bb62222ca0dddae463be958b9789d6bbf4b5. 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/QZYFZ2378958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26be583e5f6027e2aa36b650ddc552624417e1f07b40c542402b2b0219600b2. 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/CZA231204270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a9f1b974f7ca217db537e57fbb709b0eed044d5449bc45658af92f5a25aa1d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDW2391331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7215f78bf7c4135d22a82c57c2a8883aebd529bffdbb232efb67709f52b7873b. 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/QZZ662330535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7ec4889ef76f492337ba429ed65f5057c5e607e0cc34c1e1bd100ed91168cc. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/TCACG1575246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ef62b17845eba2ca3a88723a18095bdc868873943d1a78760b7e2d85fb1d7c. 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/TCABT1438222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35cbdd6f55adc267dbe870ec29945b5ddfef1b241665affe3c2a5fa3d421c99. 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/QZYFZ2378957.
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 0x07dda8ecdb3d4537716554f2142de3488b2bf9d89f0206f220949d9f1e863902. 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/CZA231900564.