Arrowsmith or Arrowsmiths may refer to: A person who makes arrows (see fletching and bowyer) Arrowsmith (novel), by Sinclair Lewis Arrowsmith (film), 1931 adaptation of the novel Arrowsmith (comi
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 0x86b6b764916ff5815020e1b0862d5f6176f8cfd58e233e1ecfee7bd0914ec9e8. 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/7f2d81f5-1020-4f1e-ad95-de83f3b58f55.json and https://artists.proofprofile.net/proofs/artist/7f2d81f5-1020-4f1e-ad95-de83f3b58f55.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 0xf103a21468376b197a28cce2eea4c2a8420f4cb126afea4e003856205f58e1e0. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZTV32405448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd095f4672eb49e663173d7734e34c050f2b5222e9d5f9052fe3fa0532dc6d790. 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/QZTV32405467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f444d3a22af37d469ccf3e356a84d8fdd3215ab92f0fd00bc13b2d87c7b9cf. 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/QZTV32405477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f3ea4a62d9e49ffa647e7d74f2654569e2ce6d3e13dcfaddc7fbfd8488ffaf. 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/QZTV32405481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39831c9b9e2a9b8192c3c61138bc7ffdec0dc6acbc5eaeaf5b7279c341f6c85. 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/GBWUL2498040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1724f65aca5b4d3030cbd5d3b1ab1db59749a405b1abdc91164bb568d419775. 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/QZTV32405562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b5a81287b45c016bf9f84be1e7f4d593547d5b049ad60454cddee9f5e0d014. 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/GBRKQ2429403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2d2ed13fcda91cfecd3f6f765aaf7e3877a5bc86b8fc194037770103ea0403. 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/QZTV32405585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b1c1797fe979c618163f0cff960f512d0863a52984cbc4f68c384b768bd289. 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/QZTRX2475500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b1c1797fe979c618163f0cff960f512d0863a52984cbc4f68c384b768bd289. 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/QZTRX2475500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b5a81287b45c016bf9f84be1e7f4d593547d5b049ad60454cddee9f5e0d014. 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/GBRKQ2429403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39831c9b9e2a9b8192c3c61138bc7ffdec0dc6acbc5eaeaf5b7279c341f6c85. 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/GBWUL2498040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b5a81287b45c016bf9f84be1e7f4d593547d5b049ad60454cddee9f5e0d014. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBRKQ2429403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1bd0b5ace336bf023ffe6787ddc762243ccf18a0da051954007689636b2c63. 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/US3DF2424432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207d757bdc7cc703b6293b4c21530ec42eaa9ec0cdea18503cfbbed681b59dd5. 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/QZZ8A2339583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3319bea2e9931945c6d9ff7104af405c009ccbefc58a60f9e9292a6df96f0b5e. 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/QZTRX2222622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99749001017661fd38602d810d1803f95e58a7eb6b7c7dd5395a0468c696a1da. 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/GBWUL2284996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4b778ec30508f59170c612b7e92620d6a016ad0a5432f598e87835fd6ce315. 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/GBWUL2221327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7151e61a2e5bfeb383a84b8c38fda68be3bb40b431204b96223f0653a41b0d. 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/GBRKQ2234461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e3779e59c7a69d2ca73b79510cd12809c5d82b54920a8b95a9fef5e21cf57b. 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/GBRKQ2294623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10d2d3ca1910437b8aba2e443bc457f03e3123ddcdf2d0647689f7bbe0b92a8. 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/GBRKQ2248717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e6403474113a2747236ab115f129bfd30413058b61d8c4c0c6862c115d5418. 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/USLZJ2278168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4077e1f858de8b4f29162be0bcbafcd0fe54c3cdefbdd3a78ef2032865ec9b0. 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/USLZJ2252321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d199eba51d4f39dd10ffda6827c6633155a83976c7ab8044ea39e269732bda. 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/QZ5FN2264988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32652b3693f301ee0d31e4aed36c4e1c698c48f2a3b1b35fef2ce5c71b64498. 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/QZ5FN2264987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6600d742bd3ea9bc3d99064ff045e5df79f537a4e347ea94db566173e2362d9. 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/QZ5FN2220677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4286e80cfed31255b9532610c0a97e797a094e766142588b4506c5eca14183d3. 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/GBWUL2171073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9326e7dd7bc5c538e4628caa48e3cc423fdf827f90d8830f94fe6f4000030b8. 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/GX53U2004638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d91b25f12b4e1ab662c53ca9fe11645bf43260bb8c0a007920e201ebc42897. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GX3Q92165986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c66cba8ea3f68384c0527d604c8bbbf5fa3cdcaaf1242ee589ccf52cb0d8e4. 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/GX3Q92053978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce95831347ebf5579f1b50ac96c88380adb04d5ed0acf5589711d69aaadb97d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GX3Q92053898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c6c7ba675ac0beeaeef76ba0ab333cacaa3386f5fc4173ba91a6a08055d877. 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/GX3Q92053773.