thumb|upright=1.35|Eliza Smith's The Compleat Housewife, 1727 A cookbook or cookery book is a culinary reference work that contains a collection of recipes and instructions for food preparation. Cookb
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 0x04fa680df9777d9bd82ae4faee68e06f47c27ed55bb5442161e54f6bd3879989. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42d7829d-9d7e-4938-bb26-54fddc4f9c0b.json and https://artists.proofprofile.net/proofs/artist/42d7829d-9d7e-4938-bb26-54fddc4f9c0b.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 0x247ffa591fbec40bd21c5dc9246f3d21e5acc4ecddcbb41301de4dc6ce8f043d. 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/USACX0702743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3e3125a666976dd4b76e4982fb86b68f2a8beb75ae7168ba17940a2bed7c5f. 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/USACX0702744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32eb73cfa89812e9a69b6a18b09ffd27d1003c99ec6667afc43ce7bce3624db0. 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/USACX0702748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35154fae432d4bf567977157286bc26d6fcae48369824653c17fcfa211008bbf. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USACX0702749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7f8d366c585581d012a9a69e5e4c145a8917927cac289557579b8c9c8f59f5. 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/USACX0702751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35feef6773ee0c2b50949133da3b209c81704e32a3eb4d7735b652cfe4ececcf. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USACX0702761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13954928eb328e25ee752e72e1ddb037dbcf438d6492be5ca00f5babd2e5ecc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USACX1003361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2aaf2384bc3671588e47413579187fd09bd8a5992052a1365cba8c4fd64e24. 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/USACX1003364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d502a3434ca8ac01004cd6e1e7c18eb9ef812e4cc339e800ae9f7f5a2d25c03. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USACX1400056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b62e490054db5388d1a5be2686d358acb6b532dfb2dace903fe8ab72b61fc6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USACX1400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42d21588677b3474d6a988ce5c56d5313288edaa244521f59dae612468d7f1a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USACX1400071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1afeb6a02036c45d2a9fc8192b469fe778bc1c9d9bed9c3756a094acb321d4. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/USACX0701632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f6aee101b7ab42ccfd7cd27de15ba1f5d20b653bccf7afee2284a9d8aa6d1a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USACX0701634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04979fba7245a1e6fee0fcc8efa506715b10f0ab45f0e443633a075b01f4be1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USACX0701641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb94d75c9fd2a871ac6eaa4c2aa6182111006f34bec3a375d7c5e42fe509897a. 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/USACX0701644.
Phantom Menace (10 Year Anniversary Deluxe Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5ab748e179e812a1954e92b21465c5fc375c16b09ccc33bf3794b2f6a79988. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USLD91720519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad45d0d3f9f3b0dafadef44dd5e5d20b3a1aa658976c7d3eaa43382f5976c8ed. 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/AUXN22451949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a79d62b6a33bccafdfac8bad9dff02d00feb7b9230eb7238899a8dc813463d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/AUXN22451963.