thumbnail|Greg Spero performing at the Ikeda Auditorium in Chicago, Illinois Greg Spero (born February 22, 1985) is an American pianist from Highland Park, Illinois. He has toured with Halsey and the
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 0x0d39fdab8897bf73314b10afa5997ab674ca579d4b53738e1adae9444d838d9e. 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/728022db-497e-45f7-96f1-fec5699a678a.json and https://artists.proofprofile.net/proofs/artist/728022db-497e-45f7-96f1-fec5699a678a.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 0x7d670a2bb0f9625b61d8fa08ee6980730878f9681fc95fada1398cdbe5450018. 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/US8JA2164002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560670dd8735b2d6ba390a2a339a9a74c918caf389adc6197d16946787fc6ec0. 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/US8JA2049001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc15c378596c4e01fc1743d38fa945e00646cf048e5b96acb0ecdcb23ca54ed. 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/US8JA2049013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa382b273601883748c178c0c57ebb95ef9dfcb6731c235f6ff05b6ef889cda8f. 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/US7SF1756534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909d0af25de95a3664d47d200cc9bfa4a1f77a359754e4c77c63cb3d3aed2c53. 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/US8JA2102001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c7149a4dd692747b6ac82c59b4299468fa2154b24fdf62279d6f41b3390840. 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/US8JA2102008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769d09db0f5f92f98a41d1f829ad59aebc1e8d197e22938678fd4c92c083522c. 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/TLVEM2464246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da8a6995497abe15281fb9673ec8646170f0a4a9020b9316010cd085b809135. 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/QZPEW2475192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab941ef54178f3040f64c0cd238e291cc301a9e7b3b3784c93981430b90b127. 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/QZPEW2453714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ad887929cb685ea9b531e200179a488b30003566d81a3f361495bf1d492964. 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/QZPEW2414468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4745e4c51daf30e35372d6838feba5c0c80811772e6f51a14cdbd772b51545. 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/QZPEW2408537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ffea1a552f5275cf6df8e82b4b1f38fbe01ce4018e556db31b55414ef80a92. 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/QZPEW2408897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a794e221b4377af6975cabdaf2fc5443da3ab0de49941baed3a4d52181b2bbc. 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/QZVEM2394928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7353bb9915aaa153bf1fc530e8c2a4871112ac6a23e67706b3fb828483723970. 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/US8JA2010701.