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 0x453469772c1ebf2aa7af99f4da49fc3b6f4d6ff553fd9499cf86e5ed0437cb54. 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/2f9cede8-4d89-4855-9fcc-2285ef1a6068.json and https://artists.proofprofile.net/proofs/artist/2f9cede8-4d89-4855-9fcc-2285ef1a6068.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
50 Vocal Warmup Exercises for Soprano Voice
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 0x9b909e42d5db6a7cf61ec3a5255b56a201b21cc82c6f06e4a9c5c1fbd2d05fc0. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TCACO1681388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665ab7022e6c471e30d556f4f3c2b3df9a12fbaae4ae1d5acac62f5f6321a4e5. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/TCACO1681389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74310f210ff41d491cfc64adb80659cdc9c56936e0abe8dbc1f41bd7ce9284bc. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/TCACO1681390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f98c5d00602ebe0ede70bc147648e0656b5bdc70bb5c41b0e956faece40f6c3. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/TCACO1681394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0612959cd908db50035a126bf88344c4182890d0caf31360107b0f5cd30762. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/TCACO1681410.
50 Vocal Warmup Exercises for Mezzo-Soprano Voice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c839d27a29223b6a24d89288fb58bb85411afe2e92121650fcb13a1f014a360. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USDY41634836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6212205595205b6fbcc8c12dd498f7a2568732a224eeb4c46857ef19105ad7b6. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USDY41634837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0dffb3760af577f53a0ed7fb9429a3d8651e75ba47129a79c3fbcfa1a2f123e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USDY41634838.
Octave Arpeggio I Feel so Happy Today (Beginner)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe958d3e4162fc2a6efd2486c0aa5454d226cf3f3de22ad4b7127be33b0c424. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/USDY41634841.
50 Vocal Warmup Exercises for Baritone Voice
50 Vocal Warmup Exercises (For Bass Voice)
50 Vocal Warmup Exercises for Tenor Voice
50 Vocal Warmups Exercises for Alto Voice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4250f32693278d8c8bc1a663e8f0096d95a57904d65d131d545e90c18121f17d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCACP1640093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cbf658a9f2369bec3ca558037eb8c0ed813e752cb5f2f75eb41d3f3443317f. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TCACP1640096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc979273c88628cc02a0a0a32b9d07afe11fe6f13f3a0beb8c68ae087f1cf6d. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:44:12Z), 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/TCACP1640099.