thumb|upright=1.25|Main sapphire-producing countries Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide () with trace amounts of elements such as iron,
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 0xd5ccf106a0a5dc46f5cbe96808377155b85f02074a14ad065c66cdbd0f2ad3d2. 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/edc4f288-105c-471f-b247-77e11e12e55a.json and https://artists.proofprofile.net/proofs/artist/edc4f288-105c-471f-b247-77e11e12e55a.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 0x62f433ec156753f9d8c7b5b75c86768bc3701b44a0d42dca02f14593e6722edf. 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/USE830975043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd6f3d56f7212ffabde60805fb9c4bb70038d7403748f1d1a674112b8d4626e. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USE831516393.
Re: Zero Medley: Styx Helix / Paradisus-Paradoxum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6632678219ff1ebcbcbfdc2baf9e791a8f31aba1c2c90ed660248aa297ef0c. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZ22B1741265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d2fdfba895f7bac8ed8e217f1b7d048b0e88f658ec8755c2730ed1f1e2fe7c. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:57:53Z), 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/USE831540295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb379ba461673691b8ac8f534676a65980f9a4eb12edd26dec6572a858ad79ce1. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/USE831553544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d99c1bc02f55f9e73dffc0751bdf8b038e1697ed45eb535152e704d82ada75. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USE831569950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96afcd82f91a4bc616717c51c0775ffecf9d3296bc969e387d85f8ae87be2f42. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/USE831579701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40be4bc5a8b30a8a868edbeca5648109c6c59c9fc7094f4017635e49b1b53f1. 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/QZBRF1864526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b762a262a376c220081082afb5346583efc92c9b2ae8732422e9d5272f6685. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4DW1832990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295bed9742955622db2b244beeeeb1e0df2dec69604c9b298e61033d1326d113. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA41804184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261bfca8af0c99b5ca7753d26d4afbc7d7e3832041e836beb03f62e80d8e0d11. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:04:31Z), 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/QZ22B2037560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9434fa5895631d20b9eef24611c2b2d9f81c35f6af574953685b9e2b34bfe6f6. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZ4JJ1977748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ded4edc29d55539e80fded1873b6752c611fdad92a157ebe2c13daeba6e082. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZES51948253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12db067cd9b6ca8720fe0eb4e7c17451104b0ec83e104111f7675b6d5eb29ee. 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/QZES81928413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fccc3579231ee815307a2fd50cf2fe24931b9d4e0bb4ad1a9b24608bc9a3c04. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZGWW1902210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e5512af619dda649c1e3f69cc584152635a925a56a396c0f3036ada0b2da55. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFZ31928992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b6f3c9aff1a5756bd559b11eb6893748f6347653d4d5c9222e1d14490a28e5. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:19:36Z), 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/QZHN31987613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f3e7411877c91036aca2136db1199725568624101027a1cb0bdeb32aa343ff. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN31987614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3a58d588d7e5d086286de8e872f3a0f6c92d7c2565bed154649bf37ff73ef6. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZHN51991761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb890d6243dc941d6964187384ebcba3b2b2857228abb8d4edacc453098c244c. 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/QZHN71917639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacf6a15560d73550dbf05a233c8939c6ab382f5a6cd0713ff7aa96624691f83. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHNB1907898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804136b63b7b0e068544f097aab660745e86824a593ef0c7fe92ea522bc811c7. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T08:48:58Z), 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/QZGWX2133281.
Smile Bomb (From "YuYu Hakusho") [Cover Version]
Smile Bomb (From "YuYu Hakusho") - Cover Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5001633d88f6e8c5de0dc728d4f6a0cc5228c37df7fed482e060173d802884. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZGWX2220772.
Kaibutsu (From "Beastars") [Cover Version]
Shirushi (From "Kemono Jihen") [Cover Version]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab647450b0040cd4120337008e307a351b79c4c052c3fe3c0a5946de9655345. 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/QZPJ32107787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec3d14369b8f8740535102d1336234ee9a4f4371f2cbf81a8b2b3625e8f9487. 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/QZPJ32117770.
One Last Kiss (from "Evangelion: 3.0 + 1.0")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa2724bacf15f20815b1a8f5024b853bf496ce6e079640224bc871a5dbe5265. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZPJ32130489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70250b2bc655bc6c65319fc308c6791a3f366a3641b7ae060e1e600e6e229f60. 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/QZPJ32130490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fb2123f529a244fa59a9b05ba6da31c3eed7c1d063210097004f998856bd93. 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/QZPJ32178691.
Sono Chi No Sadame (from "JoJo's Bizarre Adventure")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0138c362a6226190b3e9b96b5357a2bc0ee56f2591bbf63ed82dda5dda54f87e. 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/QZPJ32188127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f874efcc6b3bbe86a52dd5900057cdb6533b795a3ca98b01fe311ddb60c4e8b. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZPJ32255423.
Guitar, Loneliness, and Blue Planet (from "Bocchi the Rock")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afcf669be65fb6c73b52b92d1f49f6b6642af59db5fc014702e43109cf31414. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:25:24Z), 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/QZPJ32279221.
Seishun Complex (from "Bocchi the Rock")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59f405f90591c48a4c19e7616ad46bd86351a816b2c8a01b68913c79a77352e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZPJ32284489.
Watashi Dake Yuurei (from "Bocchi the Rock")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc6fe9d3d7e3a88902665887ac9d34a2acb6d7632642dafcdddc8abd10f96cf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTAW2357349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf903368a008581b010981bc029fe8081c7c6af492580dd4a97a443ebb8be0414. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T14:17:20Z), 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/QZPJ32305298.
Red:birthmark (from "Witch from Mercury")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138820e59466b8a9b78789281a3facb58f78220c56df5b99bd0f165941a4f4cb. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/TCAJU2552989.