Maria BC is an American ambient musician and singer who is currently based in Oakland, California. History Maria BC was trained growing up as a mezzo-soprano. Their father was a musician in the local
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 0x650e8589a29599575fb59f75ef1fd953b3a88e7cd1c001cab04977bf9b78273c. 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/0da429db-8d81-41e7-bb52-1227994d2ef6.json and https://artists.proofprofile.net/proofs/artist/0da429db-8d81-41e7-bb52-1227994d2ef6.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 0xcd12addad941e7e15717c695f09c360fa9132bef4ad9ed0bbfa5362d2cb6f33b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKEMS2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd12addad941e7e15717c695f09c360fa9132bef4ad9ed0bbfa5362d2cb6f33b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/UKEMS2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18018d78d37f471e950755790ffeda4247d35fb6a96a2818332c84b7a8a97af6. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/UKEMS2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45aed7b2079b727f3ff8f787a347614ee5bc43386525b7d145823f250fc85a50. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USA2B2102045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c62fd4d11b4e95009fda6b3a67560d71960a265216a5b2e8ab9d483d565c5f7. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/US5NR2332701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39e210f3acf95d2b8ed77093382cf5c7cf5be85ee82f6c98ca50f8761d9d19b. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/US5NR2332702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569b98884f6b85c0122968050bd9429fcc55c795f9bdc43bc74eaa6443e89e69. 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/US5NR2332703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a121d21c095dc55f3954f1bcfe950eda5d307c016ba38e6852139434e1d00d. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/US5NR2332704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3cd4ce39c71cff45d0372c347a0474763f40c2a7467b03a0b7a77e089a5cef. 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/US5NR2332705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0bf3a32f05309645241c7feda91e0676e512fc3b4e4c93e1c8ec69a5483bf9. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/US5NR2332706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4ee59253c646fabf2edfa271147188c76763f8f2fecc0a40aad5e67b4bed5d. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/US5NR2332707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f12944d52c81a0ac8623765e286559141e2641ce546bf57415d9e7d9327eca. 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/US5NR2332709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4678c6059227f169eb7a688e152c529c98014b54a554b96c744407f1bee3bbe5. 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/QMB622402706.