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 0x1b888fc4ae294b33175b7c967c42c31960433dc1007ae13eed5d3d84e19edc77. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c772774c-fe92-4078-8da2-13d1b90483c2.json and https://artists.proofprofile.net/proofs/artist/c772774c-fe92-4078-8da2-13d1b90483c2.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 0x07e893cef44e317c13c12e0b3f7b2d6e099c408548308e08c322b6754ecd8843. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZWDD2213357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fab9fb2661a82f7b83f62b32fc9ffc2c5a71e87d76e704aba0e9832e966393. 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/QZWDD2230608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdff31e0c3333f21fd4518c8c5bce28bb0233507bd02b4b8bbac39410ae0f7ca. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZWDD2230607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331dc5d810e64a25b291a85fc7eff87df56c9a7f6ea9301155407dbf11fe0ddd. 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/QZTRX2222623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ffe54f75236d1b98fe22dfa484b765af77cc11d791b33c485379965c5c7e52a. 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/GBRKQ2247355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e6138851fd04f8e10d3d27ab73aabaa75a6e158aefcefd7620317b97a266e4. 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/GBRKQ2247356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff60a909702de0f8e6ae557a6bbca6a6bb350c58cef5fc5173cb107ef593a66. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBRKQ2247357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cde2309b525221a69de91728fe63ed54120455eea894baa796da5b7dd8a9881. 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/GBRKQ2247336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c4259a576a8a5b5b87e44d81575863cd22e432072e87f29139e06a91007b73. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/GBRKQ2215970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bcd2cc5a13a99cae4b12a8767778d0ffe9cf5aac4a74c0c8d9ca900b28e74d. 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/QZTRX2239098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2edda087c54e46d7349d8ecd2f11cf2684bfd9f9326c426203b26624d5907b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTRX2239084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ca40912f8902c7a3f01ca7bfdb81f30c6830b961113968c81a4d3f770d536c. 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/QZTRX2222621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1d1e3a8873b2452a6ea9c684d41945e0302eee003bd27e0b14e6375d9a92ce. 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/QZTRX2239129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d427ade4ea42e335e0e033dc6e2a78ca9b7af1d2eef639a058f761d0c099d6. 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/QZTRX2239100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331dc5d810e64a25b291a85fc7eff87df56c9a7f6ea9301155407dbf11fe0ddd. 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/QZTRX2222623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3319bea2e9931945c6d9ff7104af405c009ccbefc58a60f9e9292a6df96f0b5e. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZTRX2222622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c080e843f577b2f21694b8ec5b2af35631235b1f225a102a2b90e43f109ace0. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZTRX2239117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe606c372fbb2bdbdbfb5fd701257eaef5e2361a6bf5055e63e3b40d31274df71. 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/QZTRX2239091.
Greensleeves / What Child is This - Solo Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a455da29689a1965c9aadf5202460b0a263ad4db383a176eed0b00272b0312. 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/NLS2R2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab0f522e9ef4ec730511cc5abf7d0a66c3e09cb920869b9088a425febfd2c4e. 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/QZWDD2213353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b8330061d7c2a1164e701c6bd257c51bd140137f4a300f35a6f16f56e2686b. 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/QZWDD2213355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4860cd8890ada980e0fba497c67019e01b9a1c60a1fe210e3f2483d62124a6f7. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZWDD2213356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da74b566184d069689d48c26e1f006bccc11b3c9fa253da18c8fd42d5decaef. 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/QZWDD2213358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505002f7b2f8e3012904df533162da00613113666fb71227b90c7a9c8bd47546. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZWDD2213359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f28d684edfb950a5c29d1a8489d1c91fb3a4b4430fe1d9358f12ef1a0cc1c6e. 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/QZWDD2213360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a1f086e7c660557cbfb637bf336be78d7c2a1e9efeca60f2ff1c937ae6b0ef. 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/QZWDD2213361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5dba5ce76e1d5eb187b455c175ec90720cae77541d5bbf561f26a267828635. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZWDD2213362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb50b5d15aa207de3abdb97587a6117293a7aa0d7878f212cc2ea018f255073. 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/QZWDD2213363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3efc9b5fa8214543a0c08cc9c5c82a3b9ad59d5f14ba05893a9f5146ff142442. 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/QZWDD2213364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282fe18ed0eaeb0ef42359269f9c91701a13f9709b88f2aab34c133af255aa33. 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/QZWDD2213365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52eac451cebd3d99c36c3fd40c93592b3e35fa72e473d59cf884be43a910316. 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/QZWDD2214518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7f55760afa9e6d9e3668ba76da74e2b437ca017264dd7178ed63e9804cec0e. 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/USAB12289601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ace8843f171af2b1c7a6da6084fb4c446de3cb9b18dd692e0aa11e2c2d0920. 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/USAB12289622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdfa233604e875c4753829b1ac2921d849209b371892cf5e6d250ed4abb5957. 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/QZWFH2385075.