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 0x9fcdf0fb391ff4058573e64fccb3bffe91a97d42203095c04a4f029fc011158b. 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/7a113f61-da24-4fe2-888b-3d87f6fa040d.json and https://artists.proofprofile.net/proofs/artist/7a113f61-da24-4fe2-888b-3d87f6fa040d.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 0x132a884cb840dcf53a18478e3335b53666c289dcbf17bcad197c4144154af497. 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/NLY330903682.
Vespers, Op. 37: Bless the Lord, O My Soul
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b21c0229eea80efd595c768d62b051c3504ad63596b5f4f49f7ecf135a82c6d. 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/NLY330903683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6bebe1576501f98bd3aea89942b9943f6552cdabed0c728b6a58462a2e6e48. 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/NLY330903684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac1f97c35c5cdb27b94cf03dfe8dcfc99816b89444c6f270c4a5e412dd72f1f. 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/NLY330903687.
Tchaikovsky: Liturgy of St. John Chrysostom
Liturgy of St. John Chrysostom, Op. 41: I. Lord have Mercy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2580e46d1e5c8236f756a5e29da64fa82de494290bc9d8b69187f709babc6af3. 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/NLN580593116.
Liturgy of St. John Chrysostom, Op. 41: II. Glory Be to the Father
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21508800f329b0f23ea5e861c2b895e11cc9c0bf57f2d25dc003e094600aa211. 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/NLN580593117.
Liturgy of St. John Chrysostom, Op. 41: III. Come, Let Us Worship
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91a24dc1c1723b5e34457e2386310373f73b4443695796c5876873e027c62f8. 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/NLN580593118.
Liturgy of St. John Chrysostom, Op. 41: IV. Hallelujah
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd8954d95193450169da1af83fa43e7eb35c675f0d2e21d931646e9399ae567. 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/NLN580593119.
Liturgy of St. John Chrysostom, Op. 41: V. Glory Be to Thee
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda381391840fe1b335af9439bc5ff484a9c9307e17ff24a36f61943eb907ab9a. 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/NLN580593120.
Liturgy of St. John Chrysostom, Op. 41: VI. Hymn of the Cherubim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574d206c648bc865e4ae207a4fad498d12572006979660f67deab08c38f85142. 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/NLN580593121.
Liturgy of St. John Chrysostom, Op. 41: VII. Lord Have Mercy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ff8de748ae8f2237ee4c299894c204d51564da584690b2bec2d05aac2abe00. 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/NLN580593122.
Liturgy of St. John Chrysostom, Op. 41: VIII. The Creed
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b6e3a441ae4b5ed46d34ed23417dad02fa2e0c7ee499e5c841e6f4d4d8385e. 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/NLN580593123.
Liturgy of St. John Chrysostom, Op. 41: IX. A Mercy of Peace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23658067617ce546e6e4daf08312cc92daa84262134d7541d116e65ddad84d78. 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/NLN580593124.
Liturgy of St. John Chrysostom, Op. 41: X. We Sing Thee
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57980bd4a17bb2a0b20a39491a8c0450ffa57774a93172c1f0f9308660f63951. 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/NLN580593125.
Liturgy of St. John Chrysostom, Op. 41: XI. It Is Meet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8eca9b1035ba9b0e90aed5c4f749bdc04e3025ba3fb50e583d18aaf32bb0594. 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/NLN580593126.
Liturgy of St. John Chrysostom, Op. 41: XII. Amen and with Thy Spirit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fbcfc502794ce9e1d901aba8ab843562af4af1336d5f280cb440d9ccbb1397. 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/NLN580593127.
Liturgy of St. John Chrysostom, Op. 41: XIII. Our Father
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b5ad650c18fa9b37d3869fea1a13d0e6225630856d6cf2c0b0e83af8eb4d70. 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/NLN580593128.
Liturgy of St. John Chrysostom, Op. 41: XIV. Praise the Lord from the Heavens
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09dbf672293112559aa030ebe20b96e5e64bfbe99eafaa573d4a87a0d991bfd. 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/NLN580593129.
Liturgy of St. John Chrysostom, Op. 41: XV. Blessed is He Who Comes in the Name of the Lord
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02eed8751428d386ed230691a7b993294ae540ac0f2df3898b0aa3e03421f8d. 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/NLN580593130.
Top 50 Classical Voices (Most Popular Vocal and Choral Works)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d520ea9da6bfbad382844c23dd6523e6591084e73fb424966aa706870270b3. 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/UK2Y21316308.