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 0x7c64e986c6b26e797f5236df308085a0145e7ae6851e37b94c66d49dd0a5607e. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c7f25d1-c255-4677-be2f-c497943f7bf9.json and https://artists.proofprofile.net/proofs/artist/9c7f25d1-c255-4677-be2f-c497943f7bf9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Folge 1 (Das Original-Hörspiel zum Buch - Band 1)
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 1
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 0x905c206b378e234759ab3ee1312ec33a42e8a14885fb4fed36a51591c9e80576. 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/DEH822400711 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c70651830274739126bb83bb92c2eaa54ae74e7eb991170522bd72a3cac25e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/DEH822400712 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08224349c16c21d31cb5e377acce74098d85ed9f7260b914c16f992c12662d58. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/DEH822400713 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adea71b74d064daf78b15ae2d410e3ccaa4e59f1d78c7be06dc6bda3606c208. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/DEH822400714 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3937b07217a3290f953ac52c33f610c575275a01fc9b7a20c0cf1072924d3b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEH822400715 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfac8dca6dfd0506925b2864271f0f33da45568c7fdf55efa7bbd0b0812c093. 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/DEH822400716 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2864fd1ed697078458c43d09250a79a19db24d9d13b4a568df07c7779bc462. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DEH822400717 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd89ba4653a2e4bc430608734ef1f5cc503aa0691fc9cd3b59436f440d5e54fe. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/DEH822400718 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7f35328f564366d42a76441105622b85b8e06e2700bf69bd68296da5a79808. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400719 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d289a20b18780e14bf1bf1de65f763e1f4e94a736de29de36bd2719c4ec668. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/DEH822400720 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 11
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbdd6423d1040bd763bccdd242f86a3fe26b1c96880424a330d80835fddd0ba0. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400721 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 12
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e2c9b67e5728c4ad84d71d43841c3f6b2488c5fee3840a32a9f7de09845c84. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400722 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 13
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9397c2b25bc7be920a0199928fcc2023e575729d007500c5d3506e81470d886a. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400723 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 14
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5431f342d89839e54cc0042c7200ba2eb9363abaaaf547a02aad091cb7a059c8. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/DEH822400724 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 15
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b44a4b5320f42e5d404cd8e0cb1f20a50bf9ee9aed9341c0355298a4452ebd5. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400725 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 16
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe270bee8928f976a110f6c4d16878dde872520bdee846c47cf990e724db0419b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/DEH822400726 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 1) - Teil 19
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c62f564badfd7e204bdb1c265d00e278062dfa8c2e8c201c71f1c1ae9f87c3. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/DEH822400729 — a six-check JSON result.
Folge 2 (Das Original-Hörspiel zum Buch - Band 1)
Die Schlimmste Klasse der Welt - Band 1 (Folge 2) - Teil 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18b8ece3bdb5d1e9a69f0a845e3fdc5df84ed65609289a00ca006a6ad15eb2e. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400731 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 2) - Teil 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa791a372cd227e0346f60a9200938da9146dba9d175f238202752e232e4cdbe7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/DEH822400732 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 2) - Teil 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acf65693238defd06e369a6b57903eda8beb60abb0cd6ed42fef406efcb47b8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400733 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 2) - Teil 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c54ef9f7c0cb74732895992b885babe6446a991f201bc1d396ba2fa5a165b67. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/DEH822400735 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 2) - Teil 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3875dfdea16e4530b6c04a7dfd772017095ee9858ca4e72141fdb73968c9e1. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400736 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 2) - Teil 7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc7301817b60e2b9d3ec7a9c624d993849f5988abbb7d1042dcd15e4c03824d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEH822400737 — a six-check JSON result.
Die Schlimmste Klasse der Welt - Band 1 (Folge 2) - Teil 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f339f0f73347395628428f8f8d6a7aff4ae06ac8b6382f438933fdb7ff384c. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH822400738 — a six-check JSON result.