thumb|Solid and melted butter Butter is a dairy product made from the fat and protein components of churned cream. It is a semi-solid emulsion at room temperature, consisting of approximately 81% butt
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 0x34ce8587f76fad2b6d7b3cca6c8e7528221d30e69de75a0365f371bbcde4280e. 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/8c5dff75-aecd-48b5-bd9d-e4ecda49d76a.json and https://artists.proofprofile.net/proofs/artist/8c5dff75-aecd-48b5-bd9d-e4ecda49d76a.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 0x63458247ec5f5a9f05dda6e5b6b411c9043f5272f04896ec6bbe0c07d87f54d0. 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/TCAGK2231990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d686e54fa99998159072a05a61f806df87a0de690330f22136c39b2f0edb202. 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/TCAGF2268167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806f65038cf022001de9b6b1dd876a12ba6e38e1eea893d50bca5dba0c141b47. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAGM2250643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139c0fb0b4858e531e9c59287c9374c7fbb39b4ca103d1f34fd34983a698c09d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAGM2250651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36967a1aed181ff7b6cfb84cd1d8668aba05f8888863df01a6b017e0530d0a79. 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/TCAGI2244340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53770763c9f12e6d5c8ca7f55338b00fd8e8ac1ec5bbe7d90e84dad6a2298d2f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAGC2279070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932fac8b4b0b3ed9d68c602bf1563fbdc93844f2a67fcf45a38179da4f6d617d. 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/TCAGH2257921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff1bf9f86ec0011b31316446dfb88e3e269750d35577a8ac7ccdf5013a0defe. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/TCAGR2210333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4386ce6dd789289b443b38c6c22e870c75150ce1439dc5fa62e35bf9ba468c. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/TCAGR2227891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e08c25b3861d04e72491e3c4246f7c72c025a3117157a265fc24d6ec6a9ccbf. 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/TCAGT2306157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e0657a2e5c91190ba63a68eb711078fc72b9fa377246a5ec87f91466756b69. 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/TCAGT2306166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f470e398de27e8f9186fb54e17579c2df739be16cffa934964baee6562c840. 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/TCAGW2355184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ef0cb855e09a3381c29dad5ef3666662c3ee73bce25e51ce119f89a36ec812. 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/TCAGW2355204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cd4926842be270a8478a4455648a922dcebbda5c308ae79bb401065696874d. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZVEM2315500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597741da228c1f64a53a388b988b9b470bcfc0f88e5c7589161828963da05b98. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZVEM2315501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b83facd9c6f1981f2418a3c9e94a13f2b060330aac40155f93613e93dfe017. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZVEM2315502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1392cd5634f04afafeea7e9af5cc3049f22be6ec371061330e08c9c44f6e81b9. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZVEM2324635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e4db1f27d5aba5ca852677cc1f0b157ae945a6f2a37580952de6abd9684a57. 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/QZVEM2324636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6512ee7e8e6bedf3b189423c475bee24c25cbcbb0f3ab2b0e5ec5dd3c73886c5. 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/QZVEM2324637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb825cb14746593ec10036ff8063e75d35946366b81510769f7276b28d548af3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZVEM2342481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce3c76e8cfe99a8c5cebd3df32dec0d5164a231f1b9cfe9153a180e55509f43. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZVEM2342479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4f52e287ec24be3d821d9dec609218dc151255d4ac6e8410b4a39eaa74ac2f. 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/QZVEM2342480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9b1e0920593bab8a4168085a5586682322482f30864fd7f11477e60e14234b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZVEM2359224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80fc1e6e8676cd0afefe6b656b8e7915f78b28976a164a3a2a2de9759c47fb4. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZVEM2359223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2255ba8d9463dcbcecc21e10e23a0c3646835123a4db3e66cf5cfa8ce165acf. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZVEM2374619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79aa1e123e44ac27b49a8e2db6e59358c509b1ce909795c86c7044fda81a58d2. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZVEM2374620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45abb28fb5823c5847c50d77374a207d1ccccd4f1c210cdd5bfe3d7fb556feaa. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZVEM2375297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9dd601d618b7602d74bdd82968509701994f8a6008f000ff1f0c51b5630629. 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/QZVEM2375298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec10b39504ee0ed781a1b1d601f0cc1797605947e5b1df04b75e45ee98dbdfbf. 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/QZVEM2375299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c5ae2c4095fd78a38b83825f55935e1e5a750390bdc41041529bb208a37453. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZPEW2400728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5642613b8773ac7ee6d0a4d77d817c9bed38fcd09a41b70f5416ff52e417e0. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZTLA2439562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb256f0574e2a3e4887f2e9178d0a4f90f3c57ee55f56374ade38341222516f73. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTLA2497659.