Dan Costa may refer to: Dan Costa (journalist), editor-in-chief of PC Magazine Dan Costa (composer) (born 1989), jazz pianist and composer
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 0xb6dbad2068e5488abd83b0e28a3b2c2d6aa4ec6442e435c47d4644e421343405. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/744b2c30-29d7-4959-b5e7-931e8d782fa0.json and https://artists.proofprofile.net/proofs/artist/744b2c30-29d7-4959-b5e7-931e8d782fa0.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 0x9a9e708af8b0b4fcfbd13bad45258904d40bb82987f3e38db3040720fe540f7b. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USLZJ1678061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441b00848c59417394eb2de91135f291c59d51bbc7b986f4f2a186752afd6d89. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USLZJ1678113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a2c41dc65742eb6764f4ab29d1a4b11bf6e3cc7f9f48ee13dfcdd9e85edd40. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USLZJ1859991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81abc07c25502f7f79ad9de5bde372d2ca1b7ab46107baf46c82628ae1e94b5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USLZJ1859994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bbb4d910f029b43541ba169fa7871518d89799392be3bb24a844e77c06d34b. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USLZJ1860002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4af4b546e6671cdb535fd9409b4be06ad2e60c63b3bc5b0941040512c53f91. 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/USLZJ1860007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101f387912e1bf8249b5ae53c0b4ab63742663c111762d051edb8e2aeba32255. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USLZJ1860018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc806a53188099a964730978b1922fe989528a4ff4cd72c914e46b56d580abd90. 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/QZWDD2271893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5daadc43d6b3771128917449baafdffc7d51d2b92f9ab74b614b61806e1532. 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/QZWDD2271895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c7a37f902fbccf23f21e3f4b9b27208b80749da46e85598cb23f3fba2815fe. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZWDD2271896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755aaf8c080438c9b5040a58614bbb0ad72119126de799d38b83884000159157. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZWDD2271897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48e1a4adc9fc0dbaa221d61dee1ee04d1697d41beffc5aae0eb4d5b12a86fe3. 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/QZWDD2271899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338924c163549c6f298d6aacaa3cd36634f47372f8bf5ba2726d8670aa2c4072. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZWDD2271900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1f04884d0467e0845ddce147ed5a614855adb70bc43ca50b715f6055f67070. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZWDD2271901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5a7218150b6300ec49ee3439bbca47efec7ee488287f732f3f9af7a2dd5974. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZWDD2271903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81dff4e0fe64f8eddc87346344d98ba48d1239bca409215ba48ec447c61b65c. 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/QZWDD2271904.