Jilçaria Cruz Costa, known as Tia Doca da Portela or Tia Doca (20 December 1932 – 25 January 2009) was a Brazilian samba composer and singer. She began working as a flagbearer for the samba school Uni
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 0xc420f4edfb996ad9d4af4e61b5a7733469813fa2f55cb9c864ea597bb3328939. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2538d25e-3eae-4d3f-bba4-5b9495775989.json and https://artists.proofprofile.net/proofs/artist/2538d25e-3eae-4d3f-bba4-5b9495775989.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 0x793ae91869954d074786cf83223f5b8a5fc5560752796bb8bb06714e083706bd. 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/BRRGE9801266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032ab1b08c98199409ee00f5e4419e1aec4d4cb741a9388797911095a4df4c9c. 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/ES71G1864397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbccc10c144b7ac41ff79944bda5608d528bbedaa9a8f5a5f58927b4d5e7e3060. 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/ES71G1864398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aad2f31008ef4e0d9625ee28246e7de1c0bdde280fe78495ba2ed312266bd46. 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/ES71G1864399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa533cd1201c2b6e5b5d05757cefae997eac5b46525998084070390c47da7dfc5. 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/ES71G1864400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe526444742d8a691ec3154fdf52584c2fffcb743747128a4ec554305609fbd61. 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/ES71G1864401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb98b06876aa66b149cb098ae841df1029e319e67a3ae857c37d2e4134777d5b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/ES71G1864402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf324ce25ba55054b0f9769de857e300b884a5229efb392040a16667bad092040. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ES71G1864403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e136292c8866ac265198df721c44e54f4f4cad8daafc8ed869ab75c10aafa5. 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/ES71G1864408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721fccab4507cc6f7b18acbbac3f702c45067c829e1b493a00ceebe71fdff78a. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/ES71G1864409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84132f765a6c30fb7fa131287a5b3ebcd40c865986fb28755de9eef3b7662c99. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:35:51Z), 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/ES71G1864405.
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 0x32f74d1537e7bf04dc237ddecbddf023a3ec75e5b607ee1ab40fb5e34c41d656. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:55:39Z), 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/ES71G1864406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ac95189b95b635e8fed7b437d28af55ad398860cbaf8d65c3ed54189a68fbe. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/ES71G1864407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077787e9f9dbf3beeba36f73da4fc1b0bc5eebc88fdcb701ba5a1afa7aede706. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ES71G1864404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d24179c33de7ac9f193719579f2ee6393a6ca8b3bc48abd6ddba05207f0e90. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES71G1864410.