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additional property: OTSVerifyInstructions
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  value: 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
subject of: OpenTimestamps Proof of Existence
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album: Beginner's Audio Book For English And Polish
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  date published: 2011-12-11
album: 中英入门有声书, 自学英语, 试听、重复、练习和说英语
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  date published: 2011-12-29
album: Libro de audio de inglés-español para principiantes
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  track: Ubicación / posición y direcciones en Inglés
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    additional property: OTSTimestamp
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    additional property: OTSVerifyInstructions
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-21T05:02:05Z
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    additional property: OTSVerifyInstructions
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-06T06:56:49Z
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  track: Transporte de vocabulario en Inglés
  track: Partes del cuerpo en Inglés
  track: Ropa y Accesorios en Inglés
  track: lavadero de vocabulario en Inglés
  track: La familia en Inglés
  track: Colores en Inglés
  track: Díasde la semana, meses del Año y el tiempo en Inglés
  track: Alimentos y bebidas en Inglés
album: My first English-Swahili audio dictionary
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album: Learn Kimeru (Teach Yourself Kimeru Beginners Audio Book)
album: English-Portuguese Beginner's Audio Book
album: Aprenda Inglês (Audio Livro Inglês-Português Iniciante)
album: Learn Arabic (Teach Yourself Arabic, English-Arabic Audio Book for Beginners)
album: Apprenez L'arabe (Livre Audio Français-Arabe Pour Débutants))
album: Learn Ekegusii (Teach Yourself Ekegusii, Beginners Audio Book)
album: Learn Lubukusu (Teach Yourself Lubukusu, Beginners Audio Book)
album: تعلم اللغة الإنجليزية كتاب إنجليزي ـ عربي بالصوت للمبتدئين
album: تعلم اللغة الفرنسية كتاب فرنسي ـ عربي بالصوت للمبتدئين
album: Teach Yourself German (English-German Beginners Audio Book)
album: Selbständig Englisch Lernen (Englisch-Deutsch Hörbuch Für Anfänger)
album: E-Commerce (E-Marketing Strategies)
album: Learn Luganda (Teach Yourself Luganda)
album: Apprenez L'anglais / Livre Bilingue Français / Anglais Pour Débutants
album: Matuto Ng Ingles, Audio Libro Ng Ingles-Tagalog Para Sa Nagsisimula
album: தொடக்க தேதி உள்ள ஆங்கிலம், அகராதி ஆங்கிலம், தொடக்க புத்தகம்
album: Angielsko-Polska Dźwiękowa Książka Dla Początkujących
album: Teach Yourself Urdu: English-Urdu Beginner's Audio Course
album: English-Gujarati for Beginners (Teach Yourself Gujarati)
album: ઇંગલિશ શીખવા, ઇંગલિશ અને ગુજરાતી પુસ્તક
album: Learn Hindi (English-Hindi Beginners Course)
album: جانیں انگریزی، انگریزی اردو کتاب
album: Learn to Speak Spanish: English-Spanish Phrase and Word Audio Book
album: Learn to Speak Swahili: English-Swahili Phrase and Word Audio Book
album: Learn to Speak Japanese: English-Japanese Phrase and Word Audio Book
album: Learn to Speak Persian (English-Persian Beginner's Course)
album: Learn to Speak Lingala: English-Lingala Beginner's Course Audio Book
album: Apprendre le Lingala: Livre-audio bilingue Français-Lingala pour débutants
album: Apprendre l'anglais: Expressions anglaises pour voyager (Guide de conversation anglais) [Bilingue anglais-français]
album: 英和フレーズと単語帳、旅行者やビジネスマンに最適！
album: Pasaporte Al Idioma Inglés: Aprender Inglés Fácil (Frases Y Palabras Inglés–Español)
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album: 学习英语; 英汉短语和单词书, 为旅客和商务人士的理想选择
album: کتاب آغازين فاسی و انگليسی , راهنمای خوبی برای ياد گيری لسان فارسی و انگيسی
album: Learn to Speak Chinese: English-Chinese Phrase and Word Audio Book
album: Selbständig Englisch Lernen (Englisch-Deutsch Phrasen Und Wörter) Reisepass Für Englisch
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album: Aprender a Falar O Inglês, Lições Do Inglês-Português
album: Learn to Speak Tagalog, English-Tagalog Lessons
album: Matuto Magsalita Ng Ingles; Libro Ng Mga Salita At Usapang Ingles-Tagalog; Tamang - Tama Para Sa Mga Manlalakbay At Negosyante
album: Learn French, French-English Course for Beginners
album: Apprendre L'anglais, Livre Bilingue; Français-Anglais

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Transporte de vocabulario en Inglés
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-17T03:11:50Z
audio: Transporte de vocabulario en Inglés
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Partes del cuerpo en Inglés
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-16T02:46:47Z
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Ropa y Accesorios en Inglés
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subject of: OpenTimestamps Proof of Existence
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lavadero de vocabulario en Inglés
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La familia en Inglés
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Colores en Inglés
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Díasde la semana, meses del Año y el tiempo en Inglés
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Alimentos y bebidas en Inglés
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My first English-Swahili audio dictionary
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Learn Kimaasai (Beginner's Audio Book in English and Kimaasai)
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date published: 2012-04-05

Learn Dholuo (Teach Yourself Dholuo Beginners Audio Book)
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date published: 2012-05-21

Learn Kimeru (Teach Yourself Kimeru Beginners Audio Book)
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date published: 2012-05-25

English-Portuguese Beginner's Audio Book
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date published: 2012-07-03

Aprenda Inglês (Audio Livro Inglês-Português Iniciante)
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date published: 2012-07-10

Learn Arabic (Teach Yourself Arabic, English-Arabic Audio Book for Beginners)
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date published: 2012-07-31

Apprenez L'arabe (Livre Audio Français-Arabe Pour Débutants))
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date published: 2012-08-01

Learn Ekegusii (Teach Yourself Ekegusii, Beginners Audio Book)
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date published: 2012-08-22

Learn Lubukusu (Teach Yourself Lubukusu, Beginners Audio Book)
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date published: 2012-08-22

تعلم اللغة الإنجليزية كتاب إنجليزي ـ عربي بالصوت للمبتدئين
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تعلم اللغة الفرنسية كتاب فرنسي ـ عربي بالصوت للمبتدئين
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date published: 2012-08-31

Teach Yourself German (English-German Beginners Audio Book)
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date published: 2012-09-05

Selbständig Englisch Lernen (Englisch-Deutsch Hörbuch Für Anfänger)
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date published: 2012-09-07

E-Commerce (E-Marketing Strategies)
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date published: 2012-09-18

Learn Luganda (Teach Yourself Luganda)
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Apprenez L'anglais / Livre Bilingue Français / Anglais Pour Débutants
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date published: 2012-12-12

Matuto Ng Ingles, Audio Libro Ng Ingles-Tagalog Para Sa Nagsisimula
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தொடக்க தேதி உள்ள ஆங்கிலம், அகராதி ஆங்கிலம், தொடக்க புத்தகம்
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Angielsko-Polska Dźwiękowa Książka Dla Początkujących
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Teach Yourself Urdu: English-Urdu Beginner's Audio Course
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date published: 2013-04-19

English-Gujarati for Beginners (Teach Yourself Gujarati)
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ઇંગલિશ શીખવા, ઇંગલિશ અને ગુજરાતી પુસ્તક
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date published: 2013-05-02

Learn Hindi (English-Hindi Beginners Course)
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date published: 2013-05-10

جانیں انگریزی، انگریزی اردو کتاب
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date published: 2013-05-10

Learn to Speak Spanish: English-Spanish Phrase and Word Audio Book
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Learn to Speak Swahili: English-Swahili Phrase and Word Audio Book
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date published: 2013-12-05

Learn to Speak Japanese: English-Japanese Phrase and Word Audio Book
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date published: 2013-12-07

Learn to Speak Persian (English-Persian Beginner's Course)
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date published: 2013-12-07

Learn to Speak Lingala: English-Lingala Beginner's Course Audio Book
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date published: 2013-12-10

Apprendre le Lingala: Livre-audio bilingue Français-Lingala pour débutants
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date published: 2013-12-11

Apprendre l'anglais: Expressions anglaises pour voyager (Guide de conversation anglais) [Bilingue anglais-français]
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date published: 2013-12-11

英和フレーズと単語帳、旅行者やビジネスマンに最適！
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Pasaporte Al Idioma Inglés: Aprender Inglés Fácil (Frases Y Palabras Inglés–Español)
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date published: 2013-12-15

Learn to Speak French: English-French Phrase and Word Audio Book
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date published: 2013-12-15

Learn to Speak German: English-German Phrase and Word Audio Book
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学习英语; 英汉短语和单词书, 为旅客和商务人士的理想选择
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کتاب آغازين فاسی و انگليسی , راهنمای خوبی برای ياد گيری لسان فارسی و انگيسی
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Learn to Speak Chinese: English-Chinese Phrase and Word Audio Book
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Selbständig Englisch Lernen (Englisch-Deutsch Phrasen Und Wörter) Reisepass Für Englisch
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Learn to Speak Portuguese, English-Portuguese Lessons
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Aprender a Falar O Inglês, Lições Do Inglês-Português
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Learn to Speak Tagalog, English-Tagalog Lessons
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Matuto Magsalita Ng Ingles; Libro Ng Mga Salita At Usapang Ingles-Tagalog; Tamang - Tama Para Sa Mga Manlalakbay At Negosyante
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Learn French, French-English Course for Beginners
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Apprendre L'anglais, Livre Bilingue; Français-Anglais
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