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 0x9a1062ce9dd4ee64f2fbeb28a9a89e1f849e65f8ff02415747067b0fcc076b71. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c6f89ac-9a35-4462-877c-298d3ab9bd04.json and https://artists.proofprofile.net/proofs/artist/2c6f89ac-9a35-4462-877c-298d3ab9bd04.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 0x0181e33c86371e96862b54d3a2a6d3ccff1dcec73b8243a28fd848a4f3d40ef4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USJ3V1856452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2895001cb2d58f9e60264735d82ed854dbae054c891481c180cddfcf2c4402. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USJ3V1887833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c17ccc327cb7af02c036e8a9b7683c2a31150d4071d5b27c02e7b74a8d8368a. 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/USJ3V2014115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5616710e46fff3fa16c681a0f98c2856f5644017e4bb3542f1830d093e8596a9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CZCO42200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e1dfe81b1f41b5b70f63679b13015af0369e6d26b547a90cc0ceafde615dc1. 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/CZCO42200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45337553a39df69deb7dc6ce3a0f11201ffbd6c3c5b80d95840cb367a3f18303. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/CZH112110004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00ca0d5a584918c57f7a05c0b4a188dfb50f1650a48221eb39ea4d84c8b8701. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T10:33:06Z), 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/CZH442200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07dc1847450e5fc1748b5b1794c768d4d1ccd942d1cd12107426ccd44839fac0. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/CZH442200043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe71c630c12d8e88ef2886751c140b19fc2746857deb1a2a9b77c28506c9da1. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZZ662312742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67861e63736156286bb49990cea819f4860b076592329ac3a2f15e456a6c30a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZZ662330533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75039beced858ab87ac702fcabfb30110e317909b0a796771dd29c1f06b3fbe1. 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/CZH112310001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c77d0568550829f777844d8b264426cc56c0171518d6971c767181e2f94e3d. 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/CZA232400636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223ee6e8fe4dc74f1a9d75eb171ce781fb96372d1b5a2eb6eeac7b9696651268. 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/CZA232201146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9ed1a2695ec2ba2d29bd12abe556f06ddb8d3f8046e8627513785bf83f5766. 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/CZA231900576.
POSLEDNÍ DEN (feat. Vladimir 518 & 7krát3)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94d333280243a6f4c83fc3f23cfaeee1d28a89d7964cb5725f05d53c4642a80. 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/CZA231900589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e59046885e78048071ce224d96e7caf95dfcf1bc923c04d3c0cb1b03725a863. 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/CZH112500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b51bc218577497ccac9a4dcf41ec5880ff5d9909f26d78ed97ea361a962326. 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/CZH112500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8f64f1ac943662bf45e3083e05614017353aa1fcb99faeab51a34b90ea1c89. 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/CZH112500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10feb2b8df38d3cfb631bb87c9f71ea12d7e743bddd30ff4c7cc10270bd39f36. 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/CZH112500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9e9ce2d3903dbf8d80627645c86a9325ca4777ea2e156910f6607056f16e11. 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/CZH112500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bce63e0803419fd840514152809a3b1d9d7ee31d8a043b9ae0c94b6f17a8776. 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/CZH112500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c092d11571f694ed8c59cc2b9a1e72bc92c9524c2558a289cd0336bd765625a. 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/CZH112500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6626e6747fdfd1109b977f923a4550584f7a633b254c1189aec6e5b75e1d8c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZH112500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b41ca50b952691edd4c005287d6cc277e01b18f3fa1ae145bf26fe4237b08c. 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/CZH112500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e064718a115518123e21a931ff780be74c4111c20211ed979d5f036bc66d63. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZH112500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d88caa0d3a239825f633c41429c33d30d8bff37e65f9cea8e6141166ec6a76. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZH112500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4364320fa005dd1849d4d32d912ce93a27bc02c1254d40175f305d2980257a68. 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/CZA232301328.
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