Numberblocks is a British animated television series for preschoolers that debuted on CBeebies on 23 January 2017. The programme was created by Joe Elliot and produced by Alphablocks Ltd with Blue Zoo
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 0x9cb9206d4d4edd847fdbd0f7480073cce0de3fe4e2d8f902a4827d14507f49b2. 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/afae7360-9601-42ac-b3c2-77a6195e5a63.json and https://artists.proofprofile.net/proofs/artist/afae7360-9601-42ac-b3c2-77a6195e5a63.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 0xda95fbd23d5a33ac6b238ff26b5233312f982d48ff61491adc8a70211e030804. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QMDA72136125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6439d88b1b915e9b3912f5ef1a5591aa7eb850e9ef9a37ca66b1f14f6b819dd. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QMDA72136126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7bcc415c6e85f3e026d3dc97b15a4d62c3f281c133e8dcb9fef57ab9d117d6. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QMDA72136127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45a0a492f896b8ae3a68ac8b7f4406c99c1d8979c922186c926755276a460ba. 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/QMDA72136128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae18c3538f76ca61a7313bc5614da74de54251b8a1a5cb76c06df656e694133. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA72136129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d76854616cec1e378de8bb842acad8728b0e33b47ba43e009884911c8e9367. 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/QMDA72136130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2180fcfa455e790e0f0db5893f6a6f7a668351382fb5bb1f033998c0b5722e. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QMDA72136171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e20ee0819262d09770534c089a3339e03905f4af4860b38280cd9aeed4ef5d5. 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/QMDA72136172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c263eebe9b25e5b7f9ed0be74c7a51fc0400227eee321104a802f3ca25077be. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QMDA72136173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba05837806948e3087260090ee0c2472b4132c196415e950d68943474da13d4. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QMDA72136174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece4692d6d70cfd7103da99c43cacac372a7a55851382a73e54139d8b062ccf3. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QMDA72136175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516e57cdb87f2794924f93b8bff4d4d3c67de017200265152d2eca47f7b618dc. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QMDA72136205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92dfd05a46bcc1ac9be6f18a04ad0aad27a2e0b3964833a22e7d94aef684f671. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QMDA72136206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138216ebb399bcc8a5a7775dff66b4a6148f90350820d583ddc33329917cdb8c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QMDA72136137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134fea693fd40638f9a593eb1638c3abae77afa0e8ecea9a7a6d51ec8835ecd8. 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/QMDA72136138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563061a8892c5ccfbc94e89aae75c1d723526fd44c9d5d11645bab130d0a1ab0. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QMDA72136139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163c0fdaa2d49002028e1414299b3dd941058fe5524d1856b8054e6fb815b1c0. 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/QMDA72136140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56868676c183849136f39b2185d4468eb941d0b5a21ea6dc3bf2dd29a75ad04f. 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/QMDA72136142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e281fd95f8be919322a24b2e3152825f380690900fad35904116d07be2aeee. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QMDA72136141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fb75432c1532d7669ba1914787d6c746bfee0f46101be0cba89e0fa0da307a. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QMDA72136143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1b3cc6bdce1ea40fd87d538c59f82f8b8a1b7c6b7dbd3e299df438675f8b6a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMDA72136167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72f44c6088488be7fddb7338b70f3b84b280e130dc0e348d693f7546a2e675a. 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/QMDA72136170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ca56d5d22ac6a172ac37d678b2ae235763d43cce941a66a6cdb9a6602ce516. 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/QMDA72136168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4c52e87e86d0858ba7f142e793c17b45dccb135e793d1ed5ae3273acff9b34. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QMDA72136169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce15bbeb1cf4e6fb210c208daf06fd7081aaf19e58ef0302de6958c32512341e. 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/QMDA72136211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e41ff9eb607bcc39dbf582f886c783400ad7d3f4a366dc83f49e54166b8208. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QMDA72136212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61087b46d934523619eb8180552cea6e2562572e1df7d59fe6379765cf9094ec. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QMDA72136213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9169b6a7f5c09be8db1f3ab2ea36090fce8eb61fe42220ee444128a0c3e85c26. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QM4TX2442531.
Numberblocks Ultimate Times Tables: 1 to 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243185408406dfb84688702c54b7b287ef5e0f6ebeff75de5e85873843028e02. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QMFMF2540529.