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 0x314446fe43e0390eed2a36d6e77041b390205fc7efdd93cc2ea8ed07720beb50. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d824eb7f-0cd6-4558-bbf5-b0e3e844a6d7.json and https://artists.proofprofile.net/proofs/artist/d824eb7f-0cd6-4558-bbf5-b0e3e844a6d7.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 0x0355eefefa689e5d4d55487c22a364ff591fe9824b388008fdd3a5117e2191d9. 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/HKC652300081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb75295a22e36086413fced9e616df3a5fef19006ce5de2b8a393ad10d8d4dd. 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/HKC652300082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258c5c2a937fb4553f9c04ad2d1577497d7594455917ff3b2dfd1dcacc26720d. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/HKC652300083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0cd27015548f11421404181282ede95c80afbb0bbb550ac2699d7695003372. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKJ962218203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb253d0edb5aa62892b2e634ed22002824800fabd2e79ecb7eb47dc512a2971a3. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/HKJ962118202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd325da160e9017487d1815ee9a77c60195707b1c63a83398b1d553a29d4e321b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HKJ962118201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0ee884616af212f96795fa0db978c636c3b60b08e22782d506b857e66a7d57. 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/HKD252200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb658e0f8f7a905955ac11ed7225ede6eb57a2517e724b0a6d749b887a5e4799. 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/HKD252200085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e69b580e5ade0297923a975adcf5805fdc056b6379df58e7d2c3344b806b5ab. 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/HKD252200095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d14aca4cf47ece37a9956a7d5f578c1e146d6c728100daa89338c1e5aef074e. 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/HKD252200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afa338b681e40e76ac3158b878ffba45aee1a0b393b3e860176d9f73dbcb055. 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/HKD252200097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c3cece3263b78c52da4982d61f3bd942b373c0b3f42b5cfe4d1f8c4770c624. 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/HKD252200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99fcf069c297f8c9f1103dd3d68716b8a0c7c44c2c88a24e61b47cfddd198234. 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/HKD252300091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8a35abe4f39941452e6e0ed12a049c676adb18e2872b290722739ce96872cf. 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/HKD252300089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77dc26d2600b2836a4f2ba499b7cbe90c223ae19efb1018f02376b54e8f41766. 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/HKD252300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de9c19906ea3d6dbea0a6ba175795725efe1a1ddb95e1c364b8742eec1b9617. 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/HKD252300095.
竇 (feat. cehryl) - Album Remastered Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98c68dd1aa23e09eaf662b48491d57086f1afc5fac7e029b27d4622daf163cc. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HKA412300697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939e646f0aad468aeb0e490cd8ae9bc45eb9364bde7bd1f7ce95605827630caa. 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/HKA412300698.
醫生我無病 (feat. Matt Force) - Album Remastered Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266eaf928ee74e1fe6fe5eae9b8df715bbb8e935f4fc7906bc9a33afbff455bc. 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/HKA412300699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe024b7b578a9bd190efcbe0d9115a2fa14248072fc748dc9ecb1c599ec6d79c2. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/HKA412300700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8377b01e9c312eaed80bc5f81939b2123f6c6cab9a8f4d2bcd95cd7678b749. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKA412300701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacab1417b1b37599ee825911e44aa0ca8c8c5da5dbe40fe83eff0a4caaa2621a. 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/HKA412300702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92bac43ae524c82a417818550c6ca7ff1d5689168bf9d98824abfe0ebc66e0d5. 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/HKA412300660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6bf2763e8831f0342acd3b9a16dd9cf0aa1469e111788b60ba821fcd7a39d40. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKA412300661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352bb0d671e68ca47c8d589f3671d5c1d81f4d50b3c6a3a438c7a46387c1681c. 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/HKC492300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c20967cb9d8d3796fc78f1d48bf1ffc6ac306da43189a069cada9aca7e42c79. 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/HKC492400011.