Sofia is the capital and largest city of Bulgaria. It is situated in the Sofia Valley at the foot of the Vitosha mountain, in the western part of the country. The city is built west of the Iskar river
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 0x2df4211124a0156e674e33e097010636d5d91b108f0e03407236bd692324fde7. 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/4440aa72-dd7a-43ce-8705-f448bd3ec663.json and https://artists.proofprofile.net/proofs/artist/4440aa72-dd7a-43ce-8705-f448bd3ec663.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Boys and Girls Come out to Play - Single
Sofia the First Main Title Theme - From "Sofia the First"
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 0xc801b7a3bcc80bc80927d7c423fe0c38e7c79c26a2271ae911d4c83aacee3bdd. 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/USWD11264594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffded04ab6d6a56b0408af1082006780d661acdb98f27b08595bb020de30ee0b. 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/USWD11467148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc801b7a3bcc80bc80927d7c423fe0c38e7c79c26a2271ae911d4c83aacee3bdd. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USWD11264594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e3e84c5ad94b17c2b1cb27fd5c766edaafa5ba68a92543ca390781a9e6812e. 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/USWD11467147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b569aefd30da587808cf9c44b45f7a656c4d152e716c4c02df2408b5d72b2d. 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/USWD11468963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc801b7a3bcc80bc80927d7c423fe0c38e7c79c26a2271ae911d4c83aacee3bdd. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USWD11264594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc801b7a3bcc80bc80927d7c423fe0c38e7c79c26a2271ae911d4c83aacee3bdd. 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/USWD11264594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f16a42e14ed204b2b19a777bb8715bb1183ee989dcbec1dc70ee4b3e99a79f7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USWD11264066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c1819babd6b4fa251601f3fd1552f4e1eb19945c119763f1123fa4de170b47. 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/USWD11469667.
Believe in Your Dream - From "Sofia the First"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0a5ae652b8ae28e16d3cae20324b45df00cc2d1156728f04ba0da9da323b4c. 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/USWD11469668.
Disney Junior Music Dance Party! The Album
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc801b7a3bcc80bc80927d7c423fe0c38e7c79c26a2271ae911d4c83aacee3bdd. 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/USWD11264594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a10f3c4e3c77f571cc351269407cc816025ee20a9a48d2b2e6404cede8cf6ca. 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/US7VG2040076.
Vulgo Fechação (feat. Kamylinha Santos & Sofia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c04145ff8d1d086d9882e6ccea21d9c3d4e1b9929b8e9b186da3cb6d7bc812. 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/QZEQU2136649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc801b7a3bcc80bc80927d7c423fe0c38e7c79c26a2271ae911d4c83aacee3bdd. 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/USWD11264594.