thumb|A folding switchblade|250x250px A switchblade (also known as switch knife, automatic knife, pushbutton knife, ejector knife, flick knife, gravity knife, flick blade, or spring knife) is a pocke
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 0x766c4e6c874369a4b9fb816ad9cbe7e8bc7d68db5b330f4d9191fa6526bd7d9e. 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/3f3d8f0c-3a94-4619-8ee1-219fec067d91.json and https://artists.proofprofile.net/proofs/artist/3f3d8f0c-3a94-4619-8ee1-219fec067d91.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 0xb3cc4d993618df91d0ce38cd2a9e11a7e149ac543aad6f6a5b7aecbabd678047. 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/SE6TI2304753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb6656174ce42e02ac02c5d9e0f909ef54dfc6b83282fcf6fef25e48b560d74. 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/NLT2H2300771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763c1b96a0a50e7005f4bd4b5573c7775a74f5813d32cdcb06fb9e4515ad027c. 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/SE5BU2493723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eeb5d67aa1ccdb72290e4b0e3653110c81de916b52bd00d2e74c174221bb55e. 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/SE62M2393405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620afd3f9a3536bfba7d7042c58e16c8a7b23d9488a7527813740008c45147e1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX89G2483262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517a03f4b38dcb47de2713b63018cd5f4a7e7de1c7c44293f5b6d97b2b5c0abd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX89G2424049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efe0c819b0db3aa385719669d0181955f1c7b6bdfca00603e7f53a776600823. 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/GXBDT2304146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52db511fd20d40cd537014d23606fb5cd8a9b908f83925ad557c02b02e1b6e6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GXBDS2374249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b89c924557953f5b74e89f1d4a16f0b7ef1aa1fa329fbb4303e6bd175cb4fd. 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/GBMJG2330408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f95650698991a8b6ed3b049b882ac88803078925ad5d507733b1410462e0785. 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/NL8NY2300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d092ce4bd8fa54cd20599ff3dbdd4aa36202d54db211203c186a258e8504c3e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NL8NY2300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d6574281628e9ffa45d8f1bd0cbe1c21ad577491282935bd8de1881e4703c6. 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/NLT2H2300370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486c7408ac6ec6514b11a916ee58fa1f31cc9a9ad3a35b14c2a9c92b907b5480. 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/NLT2H2200839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a50305edcc6d9ab400714dd80e327f5fefbb95e1d5c14be543ef06b59ada90f. 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/NLT2H2200596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134e09b2d8afbe40fa89a58ca6da5993a3c4a94fb8bc2175c1995997c47fded5. 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/NLT2H2200478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26dd35108980482ede3ee7d29d6da4baa4dbdd9d3ab5e8a53ff2210cb878ebdb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEXW62200092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552174994c30619e6dbce3619adaece0f734a8fe92647e35fa43cb5f036f44bb. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DEXW62200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65de997f178360194e20ead172cb82626dabd667c4a606091504fdbc8941456. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEMA61905030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ca99fecdc2dba3157253f3117b57ef4e46b62a8376727d8781e6a3bd165a06. 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/QM6MZ2208894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4195af1384237b4b8ea31d594aafd539e2cfe7dfc2916e376547a10730a13898. 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/QM4TW2219792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3db365684d3d0f8d08a9cc5c3f7a6d278763d0599c1935ba726488298a2d1d8. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QMDA62164814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e1d10f81c56c3f0c9c13dca688ade58f88ee2c734e209a34e4b3cb95aaffd5. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZP7F2142296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a751f9c811643f7822c097de9fd79e428f63caef50e1d86619b8370d21c28a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZP7F2136526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8efad7ab735ed2ea9a2c5c326639ede7e741995fc3a6e59b067f454a0f7553b. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZMHP2016096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa4eb4c7ee45d630300659d66899b58a23de7559a91c9eb523456236cb04301. 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/QM6P42104232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a27428f59868c5dad5bedcf5c69bdb911ce865574e55ad1a5bc23d50a946b6. 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/QZP7F2122111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ae4475803b8dc4069e752cb290b76fcd797ff1f300c3a4fbe0545a11f7ccb9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW2116356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75017b57d51f1d8eea94a3e6d7bcc3ccfee52bd743c8fab49edff0b97b5f0ed4. 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/CAWHO2022916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa46de786541dbda596c65c2a5fe9e5380caaf6797e9a2e35755b1c2acbebf30. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GB8KE2409885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efaff1f9fa2afc2448f768c1dc5956eafc5f5d25e40a6c0c24d303910e8069b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GB8KE2409886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1836e2b3be472c5bc24d6e8fde4bbba45a46eb311f50a94bb2ea7fd5f52d08c5. 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/SE5BU2493725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda57fe2adb9cf755f900a323b94563061d9f71673121abc03e3227c998e3be22. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFME2252320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa179c75de89cd5419cdd63d74c150a4aa808a919771e157a94881f112ea9b18. 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/QMDA62250009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e20aaba2762909035f9ca6e9df93dc281ad920551956fbdb16282d1f266af6. 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/QM4TX2296076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21785c2a3ad1ec2019b719d37cff59f6346c205f254203aa851c01e403ff02f6. 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/QM4TX2245221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5916531620c4d9ec68fc6e6d805a01bf072049219fc2b674aab3abf3f2beee. 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/QMBZ92198321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a1d2ed93c9cf4982d0e45c01dee3180aa5b5c7dacdd722bd51aefd06173061. 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/QM4TX2111895.