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 0xbb58d6e5022bf850b0cb38fa89f7361bbcc03dc32d0c99baa92a69f58cbb4f3b. 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/a333524c-b081-4e9c-862d-6b33506cedf8.json and https://artists.proofprofile.net/proofs/artist/a333524c-b081-4e9c-862d-6b33506cedf8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x3d3c34398b05f414a56f0327fcd47390be0e4c14a599adf8a942de614eccbb77. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZHN71979289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9357297d4c945f2825120c31c142142e5923f30b8010963aed7050e0c4955ef. 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/QZHN71985026.
Lines Song: Parallel, Perpendicular, and Intersecting
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752b40a7c12da5de2b8e66203654ed29fdc9cf029dfc068e58894c5aa3c85e1f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZHN81942220.
Long Division Song With 2-Digit Divisors
Metric System Song for Kids: Expanded Prefixes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108369c6c99a5374ab7a1f6614cc236a7badb481d147a35d39c8354377865fcf. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN81939344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880ab21a1b79a494a47876d31dfe4040852017dfb6af092ff1849d5df8cb548d. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN81945529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e782a949e43674f8c969cc175bd24852e762f594c6dd6cddd56ce666d816684. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZHN81945530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd01d7c32d01646a8d67ba40f0746aa5451aaebbe8487ab163a901c0ca42617d. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZHN81945528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4842c0d83e0147f7971d874c415f9a066623ecf28e5e9cbeaa7da75b3b6653c7. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZHN81942970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e61e575f1e47dd37e88c7f5df89fad0d79c987c5599703c79332cb38eb5c2b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN81943586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e67a37dab7447ec87240dc7774d4f742985ee6df05c3061aa3b5042a17c603d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN81943587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef19fd0c8e462b66df7d313e4ee4e6e98590aeaab78dc5f17d4d28bf9d305089. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZHN81946313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf860df865e16ed52ac88075a139755b61e972313b191a64a9b4282a63610e15e. 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/QZHN81945526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3093d8f9782270d6ca109cf0806eeb6567f961fdc33d66c3c615f5b66848fd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN81945527.
Writing & Interpreting Numerical Expressions
The US Presidents in Chronological Order
Test Prep Song | Math Test Taking Strategies
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451623c158c5528f02c15b8754e823c07eddc049d3200712c7b72161136928bc. 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/QZHN81950614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9359ad229ab1aca64ed9eda9f069066586e061d8046aa88b46e4e44b39d3f780. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN81951280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a134d01a7abeb2cb71931be432f25a69fcf5879fd1f823308ab26107d543acf. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZHN81950610.
Multiplication as Repeated Addition Song
Redondear Numeros Enteros Canción | Spanish Math Song
Redondear Números Decimales: | Spanish Rounding Numbers Song
Skip Counting by 10 and the Ten Times Tables Song
Summer Vacation Song for End of the School Year
The Powers of Ten: An Intro to Exponents Song
Tipos de Lineas | Paralelas, Secantes, y Perpendiculares
Canción de las Monedas | US Coins in Spanish
Canción de los Ángulos: Rectos, Agudos, y Obtusos
Addition and Subtraction Song | Word Problems and Number Sentences
Algebra Song | Introduction to Variables
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6451e57d723ef255bdf8cd969ec2266294e4c479be6b5f2d3383f2e492f78435. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWT2116754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed97a04fd5d50e8306d58135acfc9c23397283f1efbd6d42b1b72283254d21a8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWT2116747.
Improper Fractions and Mixed Numbers Song
Measurement Song for Kids | Comparing Measurements
Addition Song | Mentally Adding by 10 and 100
Our Mother Earth: An Earth Day Rap (Special Version)
Addition & Subtraction Fact Families Song
Australian Coins and Money Song for Kids
The Chess Song | How to Play Chess for Kids
Tablas de Entrada y Salida: Canción Matemática
Skip Counting by 6 | 6 Times Tables (Extended Version)
Place Value to the Millions with Expanded Form
US Presidents in Order Song | To Trump's 2nd Term
Multiplication Song | Multiply by Multiples of 10
Ratios Song | Musical Math for MIddle School
2-Digit by 1-Digit Multiplication Song with Partial Products