thumb|'s Man Singing Hymn (1884) A hymn is a type of song, and partially synonymous with devotional song, specifically written for the purpose of adoration or prayer, and typically addressed to a deit
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 0x6df8d266cc220f10e3b625132df0ed14a2e111623cddf43a1bfe93ecda0c02a5. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b6a89cf-4ff6-40a9-be52-53a92f2c4d01.json and https://artists.proofprofile.net/proofs/artist/8b6a89cf-4ff6-40a9-be52-53a92f2c4d01.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 0x19beac400ca38ff3573fe8a86920dfa63a2e860bcef7f7d5aae883a48f2e5140. 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/NOFYF2004010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8028379837464ac23020bc0416d6e74642641ba01f2eab7e0a5c40fab2797d1c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NOFYF2004020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb58993fbf8edd8d6a33abad32c42cc7c6e5ec39bbcfc72d31e7cfe7452f58d. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NOFYF2004030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38659d9fd5ee0b8ab42954810e95ea5ffe801b60375aed0cf4b07e1e0299d31c. 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/NOFYF2004040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d16b9cfeaecc07ba0b6e87eb0797c1abcd9d430896ed27f9eb79f55de66902. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DEZ651703359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886b9fd5e7a4adccee0d10edd9f2dfac31302fd6032973f74530a7b3ed25779c. 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/DEZ651703360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe878c61c67bc9e7bcdbf28fdc18f3531e765706f4298beda77a3a6c217cd0c5e. 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/DEZ651703361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d675aed7ace34faedd45375bd54f9c5ba6701f93bb2f6cfb80593f95e64f6b. 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/DEZ651703362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8134befde5f9d1a2e3a02811e613dd02886562548041f63ca3e104488cbd31ab. 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/DEZ651703363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0b4154e3c3493ba23790d8ed6625105d47ce26beded5fe6284391cc32347ed. 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/DEZ651703364.
ドヴォルザーク：交響曲第8番ト長調作品88より 第1楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860a36caf23ab469f1a5d55e91d0935a7d7cb1730d84576d9193c56ab0fe5501. 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/JPES00801921.
ラヴェル：「マ・メール・ロワ」より 第4曲「美女と野獣の対話」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85a9c446be36192dcb570555b9c0c5309d230fb570826985a28a2c88fe725be. 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/JPES00801922.
シベリウス：交響曲第2番ニ長調作品43より 第4楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9108e6679653c6b82a437c5dc353c2ecdb2be2221ca2c1027739d0fef38c55. 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/JPES00801923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14d14be6c39d47367dd7352ea188976988af723b1bf3cd2ff2dc14f7fed8060. 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/JPES00801925.
ニールセン：交響曲第4番「不滅」より 第4部
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d27a2b2781eb4869471f13ed44cc52458fd40ea2c24e95459ef9809fa0926eb. 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/JPES00801927.
ショパン：夜想曲第8番変ニ長調作品27-2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2ab56d3b317e098ad3a608b082f34e5464e78622ae12e3bfe7b43efce6e5b4. 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/JPES00801928.
J.S.バッハ：平均律クラヴィーア曲集より 第2巻第14曲BWV883
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0114fe0c2098f43e63ab1b2c993cb0d63aa43efc7a77633fcedf7800d1267074. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/JPES00801929.
J.S.バッハ：平均律クラヴィーア曲集より 第2巻第1曲BWV870より 前奏曲
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8554eb8f211e2524860873e8476e012b39b25798b672188fe2132d9ed528565. 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/JPES00801930.
プーランク：ピアノとオーボエとバソンのための三重奏曲より 第1楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf846341c8b8657e91acddd18beef92593503637564e7e82ecdc383723c59b729. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/JPES00801931.
モーツァルト：ピアノ・ソナタ第11番K.331「トルコ行進曲付き」より 第3楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff2acab3e35011c0b600924a92c5267f2191549dcebffaa4ce6326153c251bd. 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/JPES00801932.
リスト：「2つの伝説」より 「波の上を歩くパオラの聖フランチェスコ」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716c37b05e088107ba497f3941c7ccd18a5795aef8a9a24c604572fc97e6d057. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/JPES00801933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6a64ddc3c9c4d8e0b109c62fb1d172a3812601e966f7dec8eec4f1856989e6. 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/JPES00801934.
モーツァルト：ピアノ・ソナタ第8番イ短調K.310より 第1楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ffb928d5060936e239c24de8c17d313163ba718988f8c6b67cf0ebd67899c1. 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/JPES00801935.
モーツァルト：オーボエ協奏曲K.314より 第1楽章ピアノ伴奏版
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc540260b843ed80db44ed9d331aff7450be3570f4b88230745134d5426bd7032. 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/JPES00801936.
ジョリヴェ：バソン協奏曲より 第1楽章ピアノ伴奏版
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b5f2819719082e80a9bed99e22b295e948660014f6205748a3d8c913a0f9d3. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/JPES00801937.
モーツァルト：「アイネ・クライネ・ナハト・ムジーク」ト長調K.525
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b693a21d6330baa1dd57bb020150a7748b385c4724394c374182d221927e1d. 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/JPES00801938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f8c46048cf8c692771f5a50c0c2cd92c2cac2f27119d0d524e7addbb51d66d. 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/JPES00801939.
賛美歌：第二編219番「さやかに星はきらめき」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee27cebaaf103b4175d62e9bf69177cc6abcdf93a375639799c3878687ac6566. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/JPES00801940.