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 0xe92f421ed4d2367435f9559d91fafcec4ce049f35f3861991dd233044979a96f. 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/a100475c-7b5a-48d4-b1fb-654effd3a003.json and https://artists.proofprofile.net/proofs/artist/a100475c-7b5a-48d4-b1fb-654effd3a003.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x0d43eaef68ac5dbdd6f428495e390dc40e53884b6e00d439704e96a51a80b6e2. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0355301 — a six-check JSON result.
Sousa's Greatest Hits & Some That Should Have Been
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a5d04438f56168dbbd672afb46f96df61d28441a0703bbea1a4a0736334902. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0356701 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffb13e6f5dddd7d73eddacf94427c8787df9920290dba97ffa0c98ce1fd6dee. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0356713 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb79993c5b4e39ca879b14f0d4a73c6c55efe666c9711507b1f90a3bb344a4d0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0509805 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b415f65ac8c040e21d3dd939dfbd7e331bbe2222f718dde1badbb0e883ef6a8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0509815 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01189ac26dcbcd70e654b8bc59b309d3b02242dce9642580e372676e315cb3ba. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0509821 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143c424657a9f7152d1faebcadede51b9faaf32f29c1c1822922791a3ab02c25. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0602316 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a22b22e8db87ab42b028b7970ae86ba21d5663d8d86dbeca6f8a1013f13bf8. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0508601 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d67209e5f0492ce9b7ac1d8f9d773e9dd199b495099cfed86602648fd15e3a4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0509603 — a six-check JSON result.
The Pines of the Appian Way (The Pines of Rome)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb17da9d30d81126bb9e2d4454145867528ab90f38fbf75f068a2c9f56b33f46. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0508812 — a six-check JSON result.
From Fife and Drum... Marine Band Recordings 1890-1988
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4765204453cbacc71d81a27493e9445971b3e4c99a9026728f2958677599b3d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0508709 — a six-check JSON result.
Children's March : "Over the Hills and Far Away"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93ea9a285de85d6029b3f0e5ca25109b05a5b841267a76c1236718b2dbcb870. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0509404 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0671274a5dc4c6e39349fae8f95fbf5f34a13176e9508259d0626dd153af612c. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0510111 — a six-check JSON result.
Eternal Father, Strong To Save (The Naval Hymn) - Navy Hymn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac004b7a6910ac60c23ade90b2a8bc80a249929f7a37c14cceb00e8b3f4bf2e5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0608715 — a six-check JSON result.
Largo al factotum from The Barber of Seville (1959 - historic recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c2c041956f96e22cac6f37c449dd864866bffed12120d4bad776ab74478c82. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0910072 — a six-check JSON result.
The Marines' Hymn (c.1942 - historic recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d517bab0f6927a58146135046daff4bab3f63d2b8481bd64dfc2a82f3f43e42. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0910077 — a six-check JSON result.
Molly on the Shore (1958 - historic recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab6177647eca488527d1d0160c58d6d6a9b7039061583f93deab560cb6ce525. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0819813 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30038c67dc6a19c65a3c68c59f90994aadd9f1a23c82fce3fd6df6c502aa299. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0817106 — a six-check JSON result.
Not Sousa Volume 2: More Great Marches Not by John Philip Sousa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f461c327cef00b696f8082fc229eeac560ddebcfc944b10735e989b2a8a116. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0858813 — a six-check JSON result.
Schoepper, Vol. 16 of the Robert Hoe Collection
Schoepper, Vol. 22 of The Robert Hoe Collection
Schoepper, Vol. 15 of The Robert Hoe Collection
Schoepper, Vol. 17 of The Robert Hoe Collection
Schoepper, Vol. 19 of The Robert Hoe Collection
Schoepper, Vol. 20 of The Robert Hoe Collection
Schoepper, Vol. 18 of The Robert Hoe Collection
Schoepper, Vol. 23 of The Robert Hoe Collection
Schoepper, Vol. 21 of The Robert Hoe Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ae510849fc969828a89894aaf1f794e219923f6580f0d4b777f90c1df53a21. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0828801 — a six-check JSON result.
Schoepper, Vol. 10 of The Robert Hoe Collection
Schoepper, Vol. 13 of The Robert Hoe Collection
Schoepper, Vol. 9 of The Robert Hoe Collection
Schoepper, Vol. 8 of The Robert Hoe Collection
Schoepper, Vol. 7 of The Robert Hoe Collection
Schoepper, Vol. 6 of The Robert Hoe Collection
Schoepper, Vol. 5 of The Robert Hoe Collection
Schoepper, Vol. 4 of The Robert Hoe Collection
Schoepper, Vol. 14 of The Robert Hoe Collection
Schoepper, Vol. 12 of The Robert Hoe Collection
Schoepper, Vol. 11 of The Robert Hoe Collection
Schoepper, Vol. 2 of The Robert Hoe Collection
Schoepper, Vol. 3 of The Robert Hoe Collection
Schoepper, Vol. 1 of The Robert Hoe Collection
Schoepper, Vol. 24 of The Robert Hoe Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd927bdd5b9781c621959bb97ee0ab17cc011e25a6a57bc49f814ab2fb8c8a2d1. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R1031301 — a six-check JSON result.
La Fiesta Mexicana: I. Prelude and Aztec Dance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c28e6452baa628410a5752f32afb9c5d0ea4a14b469e4ef464d2653dd1a5912. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R1031302 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3aea1e30d7f567301eff5380be867531199658911b2650dd805fb1c584e89e1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R1031303 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f35fbb0fa7572684c80da05e2c64a9638300e5a704941ad433fef22399101e4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R1031304 — a six-check JSON result.
Santelmann, Vol. 3 of The Robert Hoe Collection
Santelmann, Vol. 4 of The Robert Hoe Collection
Santelmann, Vol. 1 of The Robert Hoe Collection
Santelmann, Vol. 2 of The Robert Hoe Collection
Santelmann, Vol. 5 of The Robert Hoe Collection
Santelmann, Vol. 6 of The Robert Hoe Collection
Santelmann, Vol. 8 of The Robert Hoe Collection
Santelmann, Vol. 9 of The Robert Hoe Collection
Santelmann, Vol. 10 of The Robert Hoe Collection
Santelmann, Vol. 7 of The Robert Hoe Collection
Santelmann, Vol. 14 of The Robert Hoe Collection
Santelmann, Vol. 12 of The Robert Hoe Collection
Santelmann, Vol. 11 of The Robert Hoe Collection
Santelmann, Vol. 13 of The Robert Hoe Collection
The Heritage of John Philip Sousa: Volume 7
The Heritage of John Philip Sousa: Volume 4
The Heritage of John Philip Sousa: Volume 2
The Heritage of John Philip Sousa: Volume 8
The Heritage of John Philip Sousa: Volume 9
The Heritage of John Philip Sousa: Volume 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8766b09526f01f02e0943943f19a19d9bcd54f3f2f30dfb57e1924dbb6b00d9b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R1000404 — a six-check JSON result.
The Heritage of John Philip Sousa: Volume 1
The Heritage of John Philip Sousa: Volume 3
The Heritage of John Philip Sousa: Volume 6
The Heritage of John Philip Sousa Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54605abc6fe885edc4ee885f598a3ed2018fba89b08697d94ed29ee7ea1f253c. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R1000118 — a six-check JSON result.
USA National Anthem - "The Star-Spangled Banner"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42825ccac15472f37bccc93ee302317585d69459d76f2c7cf7105fecc30912a1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0822302 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29227d3d77dbca105bb49be3af8f1945d6d08bcf662800fb1dd0c28c87ce270. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0822303 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5682f1752dfc6e4ad61a77f5a64f1360e973b9d13d2fb0c65b39233c7067c3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0822311 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2748d9294c4bb49d69a8ff2263061ece2e7c6e492b8c4ed5c7a224c9fdb5fdb8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA5R0822322 — a six-check JSON result.