Wanda Maria Ferreira de Sá (born July 1, 1944) (also Wanda de Sah) is a Brazilian bossa nova singer and guitarist, active from 1964 to the present day. Her first guitar teacher, when she was 13, was
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 0x5972c78ace28da8c9ce87f787f112f2e778d1c974a4f82a3fe60408df5cc8a76. 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/5cc216e3-a370-46d8-9625-45fb6db8d7c7.json and https://artists.proofprofile.net/proofs/artist/5cc216e3-a370-46d8-9625-45fb6db8d7c7.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 0x6441e0e2a4821a49f18f40ba894d02d4dd316dd1538da352738fcddd630d24ba. 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/BRDEP0000091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3886db5e9907ecf65368b9f5ac80e7c5058359c3e80b51c92f973dd44f78a93. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BRDEP0000093.
Se É Tarde Me Perdoa / Pra Machucar o Meu Coração / Palpite Infeliz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3364efcd37787d8d01161d463fa4a691512aa0ab1ecdfb259cafe50dd87a9b24. 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/BRDEP0000094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134e1ce50723da1bf8fa363ab84e99881196a9a19a583d707575caa44bacb3a2. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/BRDEP0000095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1935c23388520a33a62d92b34b2daffaed0f20da11ab46b5b1c71ba2a51be2. 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/BRDEP0000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bec35a962c5f51815b024703167e338d963bdbd1be14452266b8982a87c1037. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BRDEP0000101.
Two Kites / Fotografia / Eu Preciso de Você
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476ee05bf5a2aac366eaf3f89623aed74f33a79c70838d7e02b042205752d170. 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/BRDEP0000104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d91650e4f66f22f041be39666b9deaa8c5737b055e581c0a80c557ca0ed9a8c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/BRDEP0000092.
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 0x017e9e49b4f948ad7cb2dec4ea57a438f979e9e94c6ca198d73e510fd80e3776. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BRDEP0000096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e332327b9b0d90116ba3eef935de9e06f9725677d57b88512ae1ddc370adac0. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BRDEP0000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57729a71091aa117b6d4cfdd1d463cf8e9625e293832e0449075fb6c982b2707. 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/BRB580600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0197887a526eaed3e982147117a93186027418da864ad2a82fff5aeaa9ee4373. 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/BRCID9500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47a54a7d51020ef9b6aab583b91e62f3201c2732f92b66e0d27a2a729e1769e. 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/BR3440900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57729a71091aa117b6d4cfdd1d463cf8e9625e293832e0449075fb6c982b2707. 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/BRB580600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5b99241a45fa257a2486d24e423ba9404709d9dff199c0613a32f059a989f5. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/BRCID9500069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9686b93849be63374fc72a8c8efa98dce08af51b6721b12d8f020be874272c. 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/BRABZ9600136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b228ede5e2b12c779d8ae5c8751052c0faf5a03b3dd0ab6f4503f730acdad3e. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BRABZ9600140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9f364f994162004acfb09c44b93a4908df2144b6e6100111840ca582c6df99. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BRABZ9600141.