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 0x48f786914edf49026e96665cf216b3672605e816691db0c5555c59a8f354b1e2. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b2298d3-ca39-4ebe-919f-831ea3d7411f.json and https://artists.proofprofile.net/proofs/artist/5b2298d3-ca39-4ebe-919f-831ea3d7411f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Unicum: New Songs from the Leuven chansonnier
Song of Beasts. Fantastic Creatures in Medieval Song
Two Lutes with Grace: Plectrum Lute Duos of the Late 15th Century
Straight from the Heart: The Chansonnier Cordiforme
Terriblement suis fortunee [Chansonnier Cordiforme, Geneva, c. 1475, CORD 38]
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 0xe3ba3e7e06933fb60346044dfa7615f77ea8236f616e95fc0949d7d8e6a3c0cb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKI191601903.
Fortune, par ta cruaulté [Chansonnier Cordiforme, Geneva, c. 1475, CORD 27]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939907b12a6b6ec2cb950146ece46334d8dbaa8965aea86bef9ed02fcebf8ce4. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKI191601906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033eaab74cc00533c247f5d8f4975157d1108c208b270d8a8fe53956f033d0f2. 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/HKI191403501.
Skak - Frolich geschrai so well wir machen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffec0e795cd8def657c86ead5084df38f52ad4a5803cb865ca93369b4f09711. 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/HKI191403505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561de2745ea43ad0c7b2c0b78043ca1e62d3cd42a52aeb0eefe57b690e1f33ec. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKI191403510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0259e2e48a3fe3b1d70cfca01c1e4a245ce197e4ad34f5703b86b49081aac8. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKI191403502.
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
The Cosmopolitan: Songs by Oswald von Wolkenstein
Do fraig Amors (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8f8dd2393819488197f06f64cfddbce93ad7bc971026e1d524a8052c5ad11b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEB901400301.
Freu dich, du weltlich creatur (arr. M. Lewon for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4c66d230a28a6f7eb639d33ec3e7915384ae337b86c40284368d20b1ccad71. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB901400303.
Gar wunniklich hat si mein herz besessen (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5ec5b878923fd26d685a1aa1373d9c7aec99d3a25e787ce5fdad81250d7468. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB901400305.
Wes mich mein bül ie hat erfreut (arr. M. Lewon for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16758e3a91d99d683d3cc45cbdcf2ed873b7c7cbe048c72fddf304d66ee11e71. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEB901400308.
Wer ist, die da durchleuchtet (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fd270e569a30d1de168e913091aaad037be940025bb478f5c9b3c62bfe91be. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB901400312.
Mit gunstlichem herzen (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25561d90b8b80149f4a6ffafbc5c6f1e57f63904be43b6dadbd81d4c0157ded4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEB901400314.
Stampanie (arr. B. Romain for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dea064a1cff9b9e77ec690b49d4f21af63cebcf521a08abce79e77bb8c44a9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEB901400302.
Durch aubenteuer tal und perg (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf038ff4273370e25781017adfd143f1b7a4d39fd9f3fc85b9e5659080a9ca12. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEB901400304.
Es seusst dort her von orient (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5c24ef1abf3df3d6aae650a7b8db3e2ca8bfdbb19572d0a8ab5609d70a1007. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEB901400306.
Ach, senliches leiden (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4541d9eae39565d98cc3f56adaf8f5762572327fc64bc5a925c57374fe97aa52. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEB901400307.
Wol auff, wir wellen slauffen (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38039f3d1f4b7f217d7d1256f84daf58e565df7e63b1d94a16eeecdc265ed3b0. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEB901400309.
Ain gut geboren edel man (arr. M. Lewon for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9115cd6cf2bd97ad6ddfce630c4eeb6febefc9c790bb381ef6f57b1bc4185506. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEB901400310.
Nu rue mit sorgen (arr. M. Lewon for vocal ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd2c2325b05961b4fd4db9f19aa523d748fa31f6ecbd30fead47fb9a07a6d94. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEB901400311.
Wol auff, wir wellen slauffen - Bog dep' mi was dustu da (arr. M. Lewon for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7ae6773aa12e56d10390972fc8479474f48587e434611eb3696e6fc8c796c3. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DEB901400316.
Das Glogauer Liederbuch (The Glogau Song Book)
Glogauer Liederbuch, Pt. I, No. 249. Die nacht die wil verbergen sich: Glogauer Liederbuch, Pt. I: No. 249, Die nacht die wil verbergen sich
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fef196ca61102f2dcb93b326c1754fe4d8f68d3e07e9fee6019ba7910b88de4. 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/HKI191159210.
Neidhart: A Minnesinger and His "Vale of Tears" - Songs and Interludes