EM, Em or em may refer to: Arts and entertainment Music Em, the E minor musical scale Em, the E minor chord Electronic music, music that employs electronic musical instruments and electronic music
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 0xaf5370523b681e522455a0066fda4f3a4bb9a7513280819c994c6c17189662cd. 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/042f4154-fdd1-46a9-abb4-2925540c4a3c.json and https://artists.proofprofile.net/proofs/artist/042f4154-fdd1-46a9-abb4-2925540c4a3c.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 0x45d135eb87afbc7718afa11131eeffd312121e9c375eab3fa1d89d5b0c69b08c. 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/QZMHK2240324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91701fe5aebb5a5c2bc508e9b66b4e4328ca9d65255cfc8d347e30ed894ef59. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GBKQU2378492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3315e77c5046400af44d4630a1dfb829a632296c613f43f65f6a35981368b245. 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/QZMHM2307412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc0afd67c1e2f4c157be975164a8b5da1597b7759c2cd1e77a8030e737beb42. 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/GX8LE2315935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f2af756decd64fa182903613fd8c6ed33b635c713e43457271945c690f4bb7. 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/GBKQU2357434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e7097569c155d5d86648e0151e65465b64078b472b703bf38d183e8ff45305. 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/QZMHP2386183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36721922255f24c7469a53702d897faaef9765c2f93e03c2b611711d7a8913e. 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/GBKQU2348421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa793e0d3493141457adacc683f67ffc26151b8fa39a9fb24bef0885d8b6394d5. 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/QZK6N2385698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574e3b6e9a1541d4c1bc178e6a1b570d091028650f808c7252d8868f0c97c46d. 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/GX8LD2389465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797facf25edb537a156c0eb0f8ba0ba225cfaf6bfa8bb49530515ff30620b81d. 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/NLYK92300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cade7343379f059eb1a16207fa4e4c4ed5f1346d62e7857c9d20b205e55459. 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/GBKQU2312693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed8ef5a76e1f71c3a89f8587d87428e92520ef91755fcdb182a530b6908dd25. 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/GBKQU2303420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3de1c2ba52d31e3f24fdeda1a82d3eb1a41b03d06ca4e1c9145f79ac9e5a5b3. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBKQU2303421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bf179595dcda59ce679106025ec9c21c6f0c15f6e75a396bfea5a58cdf18c3. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/GBLV62214123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb66d06c103a78b95b4d86947a8cf28549db16793d65ed9fe9222537d6c92f33. 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/GBLV62214124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5bd25a094a5ed69caf99efded4f4cbccfa8fb827fcf77ce38a5461b172889a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GX8LD2203480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de1c1c31cadfb06d817013eaf16f7d73cb5e1c9357147160b41fc8addbe1f66. 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/GBLV62207236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbbdb75b1ce2e4a19d775078f9709fdf49a0b61a2895fbaff448c185f7ad526. 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/GBLV62207237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0b0d7ae6233dd7a91b4f24a5221b2845e3c3fa11165be78a4bf1f0986aa4fa. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZS662274574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e727bd69f0542b526ace7c23789c428916f6f9dbb6f91845fa10c57e8d10ce. 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/QZNWV2232284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c654ead20098a057db1097787890a02bf61d1b912ef4c6c1b595f8bc66bbaaf. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZS642290204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d956a206073ac0f5771a0be4c0552cc362ab656e56b1b83c9d8d9c7a127177. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZHN62184526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc933ed4f27477f4f6c1e49815e972a49d3464851e247a73330fef86665bc090f. 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/GBMJG2105375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9dcde53333e264237f47ff46f939e4f06334eea3a2b1dc855b3c981afded36. 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/QZFZ32118595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2640512e3fd3de00ff1b764f6b5cde42388cf734dda58f384296be6b98eec606. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDD2364220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede16dbd3063cea43dac711ed122897476fe13246d4be0cad978051c2f286bd4. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBKQU2387508.