Anki (, ; ) is a free and open-source flashcard program. It uses techniques from cognitive science such as active recall testing and spaced repetition to aid the user in memorization. The name comes f
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 0xa949f96f9c8f734029695447b1145fd882d65b015ffa19d90e14e20ce695455a. 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/0cd46428-8ae0-4d2d-af94-6bf2c70a5b5c.json and https://artists.proofprofile.net/proofs/artist/0cd46428-8ae0-4d2d-af94-6bf2c70a5b5c.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 0x369194042768d66f22fc41d23718aacf68f7b523f0c03332351a9eda2cda9f6c. 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/USLZJ1634821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f641034ff827b8d54bf36ab03c50c197015022d927bba7c5107881592f011e0. 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/QZS1Z1640577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045d1d869a7d1064aad661adf09fda34c308ea691b15b316921c8b279cb72d5e. 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/QZS1Z1640578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35ddb0d36f713931077f6b95e3662a8bfc30acf0b8cc4573616540b12a7fa1a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZS1Z1640579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd533adfba6edab150f5b0b8b82692db449fbd777d785090ce337e93a81243448. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZS1Z1640584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d58a54c0440a03b772152608456ada106baa940bdf25f85d8ba47ff28e11f5. 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/QZS1Z1640585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd64b86bc3aa475ce6f767613506445e353456b23d54769743f57163dec87a2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCADA1732769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7044697ca8e5265f2a2c712c927fe25505f16c1473af6c8f786c93e6c54e775f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1859893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2373139a18054a1bb23c8c7f8f9b1477f77b4fc595b229e814424dc19952b79e. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/GBKQU1859894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8634a3f46d5538d75b73cf8abb584affb4f37928d7ce27df8814a82fedfb18. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBKQU1859896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac694676a7450bef731e18fec7201c79b2984f25d2ddf1abf3112da0ee6d5b9. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/GBKQU1859899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3533f5515d00b4d52b89f1cb502b56ab571b615212703f9784d8e4c80c72e20a. 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/GBKQU1859901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd029f464ed7e9483e3f1c0220546c1b9023efb98d0f72c04fed18e2da721469. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBWUL1910857.
Rafted (Inspired by 'The Outlaw Ocean' a Book by Ian Urbina)
Rafted (Inspired by ‘The Outlaw Ocean’ a book by Ian Urbina)
Rafted (Inspired by 'The Outlaw Ocean' a book by Ian Urbina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33271a0b6bfb99d5b0183a45635d3b471448841d2d1c9e3ab71a584c180ad759. 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/CA5KR2166599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14750c82ad597790fba9dd1a7a825cbaa73f7e4ed97ae8119f5c19093d04e769. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ8A2561338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c7d77990644c435dca51586bbd3466782890daf6180ba10b818b0681b75418. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P1942688.
OMG (with Carly Rae Jepsen) - Anki Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ef80d4902709b0c19c41883cde33b08fdbf3a0608f8f3c7d8d02ead44aeac6. 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/USUM71917185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e7362d41f31c9d59b243ee3b76cc39030de63707040e7f945dfc55aa9c0cd3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CA5KR2259312.
Forever Young (feat. Melanie Fontana) - Anki Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae92fccf74dfe1b6ae3a84c846f1a5790def8a74ecc8c51be72b747a3e7924c. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDM32022929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f31001a7d6608daddf87531e4bf130be9c25ef040f0730f80f265e1e483aa7c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUM71810928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54af18687123e67b3fbbe487b36933158f0daf838dd7c501b18b782343120695. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USDM32133901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320348eb586dd47e5812830288139fd15ea8ca68a25792dd8b7f345b9b63a21f. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBKQU2350933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec311c27b972edd06989771e36b63c1f924ef427cad1cb584a2bb23f0b87431. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2314362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c98dcdf3ea08f0f595d841c15de617a6af82d0bc5ffa368cc2c50686a73ad2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2327101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc255bd843fd749fa5227f9be378c9b7a7d3e6addc48f5ea801adb0d228f93016. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GBKQU2350935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf165850013769ecb479bb5bd5ce7e89fc5f1899e14a382e8427bd0ee17963a85. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU2350937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b2dbe2c4136860974acff1d67cf8ecc37f0ac2c3876ae5d10a9177aa4c7700. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU2350939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4d18a92a3ca96fa3b9ef03c5056ed320f312f027ded3c45039775574f42ea9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2344207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aac4e8d1c32a30d16caf8e241f5eace2e94825e174fae806003fdb232a72fb1. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBKQU2350941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b798e65373c61d7b1a1e46bf0889ec347b04953eb41962cfb79b85debd012de. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/GBKQU2350943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985e3523e10e8655639331bcec09f0b770d076e17142697f1e0f4eff50c0e8a6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU2254825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7877ac7c24787ee5d8f2566af57a4aa373cf2e3bdcee9962cfc28fc2f373329. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2250086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e61dbd00cfadde3e5454cfb8eec21dfd88dd79ef080357d6b4e650afdba134. 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/GBKQU2224501.