Doménikos Theotokópoulos (, ; 1 October 1541 7 April 1614), most widely known as El Greco (; "The Greek"), was a Greek painter, sculptor and architect of the Spanish Renaissance, regarded as one of th
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 0x8e36be96cb83ebdeffa95f62846a924518c92e84f0fe35ff6220f6fa6317a520. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/550124da-d596-48cc-8b65-ca1dcc656451.json and https://artists.proofprofile.net/proofs/artist/550124da-d596-48cc-8b65-ca1dcc656451.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 0xc5eae190658e25de76f61542db7ee0e171152eca55700af8ec4c350f6eb10e0a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ES54D1900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15181e4ff99f85e1cf64581b4624d8dce661b7c578d9d6c7c2b8a4ba6c40ae8e. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T02:04:01Z), 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/ES54D2000081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179048fc56902e94b33fe9eb2409b125d59bf6f4bc0dea6cec71b0e4e5ec4055. 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/ES54D2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3684221bae341573c59fe77c583a566a859f846549526fc43ad8a4c20c272ad4. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/ES54D2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebe3325fc69767bd1deb45ba82d9efcfee8a507712292ce4f1475ab92c8178a. 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/ES5022200278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb784ec71ba207d83a6bbd15c48a7a3087f9b1d37a3b35c19966be652c0ce8bb4. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QM4TX2260450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71db47932173916cc283f380ebb64f55aa46e181a5e67f4037cf392eb4dc3ec. 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/QMDA62224015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d81adf45ccbffd9e1dc44c98d59dfb28acae437ff2f06f51c93f722bccf4412. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/ES1022300085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97c986bb8f09c7fc1532f9538ed030fbb7fefbd97d73d08b0f49b65d8777f7f. 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/ES5022300115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921ad926a4f58c7512d735841f90058d4a161d507122c0248fb3fc775e734041. 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/QM4TX2338846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb28cdf2dcd1b364958d05bfafd9f62c5a3c05ae4f703fcd91d4a02e2b4f505. 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/QMBZ92332334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9758e316eb0ce2d1ca2a25a7be106da8c6b6cffde6352e5580d32cab8b64cdc. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T01:39:02Z), 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/QMBZ92405765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55330dc9b18943b0166844894f3d8e6d132b4c580c859a91693371ba2fac039. 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/BK4DA2550639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7976c65c33b23fe6053de4933e370930f5190b5381c571c72dc5eeff61653ced. 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/BK4DA2301678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d98240ec5b34606ffcef7af41cd9de8aa6e4680b05fd72e1239b3f90fc5f504. 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/ES71G2337513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e362f805286aff5e57913c5cf0c5efcebb745e885f2ad73a633f6c10dc8192. 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/ESA011657542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e7178909eb78e3ee336fbb42120f1449799ca77d4086bb04577d5c7c10513b. 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/BK4DA2410691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8357f5b019f9456d498b63d9a89b1b5dc6e2b650360dd86768f5dcc989dc1607. 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/ESUM72301225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e9c0b6798492fdc439017ea93be697cc99e9910568a6183deb726e3110240f. 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/ES30E2000137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4673dca7c2b0e069d18c469ed5424f859200d49ae3b94989f5bd7ab3d11900a5. 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/ES71G2146321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29be19537b2fbfac803123a3ee58eeeeb0a47bf9c630239c1efa237b2d7a24dc. 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/ES71G2016402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e346aea0fbb59f47bf30e159db195438c2e8067b2826d263b17d9c99e5488a. 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/QMBZ92394002.