Merck refers primarily to the German Merck family and three companies founded by the family, including: the Merck Group, a German chemical, pharmaceutical and life sciences company founded in 1668 M
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 0xff8cfd5bceda5e7aa0035e573cfc860671e1c0e96d20897bbb8e4d6bac1f9d2c. 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/7daca7e5-1f84-4ffa-a80c-fce4513566ee.json and https://artists.proofprofile.net/proofs/artist/7daca7e5-1f84-4ffa-a80c-fce4513566ee.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 0x5ed361787f32b0315d777a3dc45194a6f8460ea9d14be05a50b6b0507d03c7bd. 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/QZNWW2369842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14525ba786f67c0d62942d2791f82ad3e21a6c61c2c403c93fe2fca247dc7571. 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/QZPLS2382504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e922fdd4c523b49e0ecdd4389ca5f254b55d3023f0af94513214a71570b840. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZTAU2340439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e922fdd4c523b49e0ecdd4389ca5f254b55d3023f0af94513214a71570b840. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZTAU2340439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd763b5dc4a3606d94b7fd384190218c16dcd4a36d9335d389ea81c361d801b1b. 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/QZTB52312290.
Holiday Spirit (Federal Contraband Remix)
Holiday Spirit - Federal Contraband Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186375c0d724236c79324bd57427fdabec304bd5a195bb28f9b3d6d038975e8d. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZWFR2342465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af7613de15ff9e1fe26fccf22fdedf38fb4f5cc6c758dedcb2403b03b1bfa78. 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/QZES62495511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af7613de15ff9e1fe26fccf22fdedf38fb4f5cc6c758dedcb2403b03b1bfa78. 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/QZES62495511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917b560bbef55a137efdf0b96d3cda20e9898c008ea5ae0c2cc017d865b08158. 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/QZK6H2490027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdd9deb8a37939685589e2e3922de87a117f8d2f18092dff8c84a90fc38b43b. 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/QZZ792438475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf160a57151d38c424ea29313160ef69c7566f7067b746aee0e2310689ab7893e. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZZ7U2448199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf160a57151d38c424ea29313160ef69c7566f7067b746aee0e2310689ab7893e. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZZ7U2448199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e95d9f0eeafb9da414c09e6d354cfb58edc15f89a1696dfe6ea3910a8f2aafe. 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/QZHN32592161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e95d9f0eeafb9da414c09e6d354cfb58edc15f89a1696dfe6ea3910a8f2aafe. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZHN32592161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd329786c22a331635de754c859b8452df1c125db1c2de24dd1bc62d685f0f84. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZK6G2523081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd329786c22a331635de754c859b8452df1c125db1c2de24dd1bc62d685f0f84. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZK6G2523081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9cdc884e4bf0151792f80a3e88978eea6815d499d5a83f475ce8fb7499bac7. 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/QZK6F2585539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec57648d8fec4f2881d89ea266417172462841bf8708ed2a9bb48aa4decaa05. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZK6F2585540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87efab5fcb84e38650d9162512a9341b8da6745e57f1bacd84ca821405098585. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZK6F2585541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f2a7d69977995fc07a67e99ff51a73ed93d51135e8f1b7b66b0fd8330bbac2. 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/QZK6F2585542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b19620fe5931a7cb418a20617d2c104a1dc39837513ebca7ed30bb174d5627e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZK6F2585543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fe62d2bba9837bffa000c5206fcb6f284266a8efbc14676a0c8565a1c25f8d. 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/QZK6F2585544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d177718f5cbc92b7c1a69f6fbf51a78d51b7373d7d40a8eefd97685760f4dd8. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZK6F2585545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a880ec538bb20529ecdc02b0ef7bcc578eb4c6cff100fe0347ab75f1361eaf. 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/QZK6F2585546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c588c7b9460d37eecd6bf0e881efdf60cb722efc4dbab5b6aa98d63db6fc49. 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/QZK6F2585547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a01bb5ec8d37be0446dcd17b72c4aa19a012ec30ba9451886b885b37e1e1ef1. 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/QZK6F2585548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d19f488477519067ea0d5cbcf9877f6df2300d5a895736f8f01608795331849. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZK6F2585552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da1fbb2d54f146f17a5d3239dfbdf43418fe0c89957d9272abbf6dcdfd9657d. 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/QZK6F2585553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b19620fe5931a7cb418a20617d2c104a1dc39837513ebca7ed30bb174d5627e. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZK6F2585543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fe62d2bba9837bffa000c5206fcb6f284266a8efbc14676a0c8565a1c25f8d. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZK6F2585544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d177718f5cbc92b7c1a69f6fbf51a78d51b7373d7d40a8eefd97685760f4dd8. 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/QZK6F2585545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a880ec538bb20529ecdc02b0ef7bcc578eb4c6cff100fe0347ab75f1361eaf. 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/QZK6F2585546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9075966b15108d6ced54de6063eb1fe74051418b358aa9814c04d9b92e5a535. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZK6F2585549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572a53dcba9e123b517cb97ddf1318fdf77139662957f7aab42ded10f93e46d5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZK6F2585550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c896a1b4c874d3dac0016fb0acc4529e4cd3c69c74127b005c3563eef4b96c2. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USLD91778455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e83dd52423ed1abdf303c5b71c473822b20186130b5684bcdefc14f38b50442. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USLD91779224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30543360ab863275a7f4db3780fad5a499e4094b718e11583c433dcc7203b351. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/USLD91780804.