Ivan Rebroff (born Hans Rolf Rippert; 31 July 193127 February 2008) was a German vocalist, allegedly of Russian ancestry, who rose to prominence for his distinct and extensive vocal range of four octa
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 0x6dff1664179e6f9383e7991e26b201be1a1e9b2f4f282e14f7fc832dd2807733. 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/c1653672-1b0c-44dc-934f-175b76a4571c.json and https://artists.proofprofile.net/proofs/artist/c1653672-1b0c-44dc-934f-175b76a4571c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ivan Rebroff Sings Folk Songs from Old Russia
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 0xc1734ee2f2c39ff709ad0df4d91fe7166888efe92f29875a16d7a43ea659ff92. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USSM11803527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f190b28ed1a137ceab1af7aeb420ca23f087e97c38e954ba6eec0421b6e725. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11803529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284dd0a959a9562cde5ea372c6e1a2ff20a36b74831a8475c47c63082ca66cf3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11803530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0e0c7d310dceb6eef3b7af1c369054bc688cc5e989f29ece6e5378b96e5286. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USSM11803532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e65298559e14961f00eed010996dca972bd1c2ffefb45dca1fe89cf3fb2a43. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11803536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbf60e18fd2b1fdc307d877f2235e25a727273eb615c9152e3963b2c6dd41a4. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USSM11803537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f54729306c9209deb5160386d8bfc432a0ff6eb23324f498cd5afa6ba73955. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/DEA761103514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e9e35e9623c098595a37aa5e626e0af6f8356f39c75a3f8986ad53280f1f07. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80850174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5024a04a84840cbdb59710d8b67af968a5d26f75e82f9ba7fca763cb1f2b6dcf. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/FR6V80850175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c238b1189e48ccdf28128ba85494f38a26dd4061fbeee1022684e587c5293e. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80850176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975cfc39d709ed84d99f2f8575d5d38aeb69d9605d616bdee3f38d4b7cdfaa91. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/FR6V80850177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a353077d590142b2caedf91e1854c62a559ace112f60ea9695789241d68e00. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FR6V80850178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6edf73b6025f9f0cc87109951720578f08cea5d79e664f121697253ecc7bbf2. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/FR6V80850184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267d90b3b1944082e1d26db7a168dfc40874c2ecf6abd59d06d87c16960ea1c5. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FR6V80850185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218206dbf97554fa47f768186a1adb2a29c937b00de5a756f686c2ac17db8e4b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80850187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91858979516aa362bd47a7dc3c50568ff7ce66452760e18cb60e1c08d3b3e38a. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/FR6V80850188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa5310fde29f067bbe18be5db9614e57fa2fedcac0c562f0513c7d4379c4461. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/FR6V80850189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c1a95dabad78b5a5a1df7b0303b8d1ab7c0ae6cfd205f5177babe03f88debd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR6V80562581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0019a6e255456030f20d3f5ef9fd48c98fdcd4457ae183323659071e2ba59f4. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FR6V80562586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6477d5f7d5e1ce0dcd42e68ff1f63c8199120f70f4ddfefcd9fc6f5040d2f1b7. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FR6V80562587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21e7ba031b69b5c96160d4e1cce669b37bcebd6fdbad6a971ab810582aae7dd. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR6V80562590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68b285b20f2ceb372ddcc16a26e5c8f5e477c96abca0720c4dba40480710765. 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/DEA761103503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659c2b6a553cfc020fa57ccada91873be31bd9c9b3554b1ae479e77ccf7c47c7. 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/DEA761103510.
Weihnachten mit Ivan Rebroff - ...und Friede auf Erden
Erinnerungen an Ivan Rebroff - Seine großen Erfolge - Folge 2
Die große Geburtstags-Edition - 95 Jahre
Offenbach: La belle Hélène - Sung in German: Nun, ich bin Ajax der Erste
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2e28f1fb763fe5a1ee3d654b4ee8165c09ec28e376f7271efd2b819776585d. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/DEF077505250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd02a73399559f982f5aaadd99d3f63fad6bdf773bc7782956719375034bdce. 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/DEF077703390.
Die Fledermaus, Act II: Dialogue. Adele, wer hat denn dich hierher eingeladen?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c55817e1cd3f8cc39ac743331d83ba773fb2f23c1fcb0e226ae21176cca1e35. 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/DEF057530626.
Die Fledermaus, Act II: No. 7, Couplet. Ich lade gern mir Gäste ein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd766ddd0292ef95d5654bd638a9b1d27db42be6d719581b379b40c16436b5474. 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/DEF057530607.
Die Fledermaus, Act II: Dialogue. Durchlaucht, hier ist Ihre Brieftasche wieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d0c0b65ca21c098c156f43db4dcad46a706b99f871f21e021f1ef2f7b42974. 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/DEF057530627.