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 0xec42047f5e6f633f7ad9b436708a458b3432f8f9bb4249ebdaca6fd787653f05. 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/733f2fa7-1135-49ad-99a4-1867288cf034.json and https://artists.proofprofile.net/proofs/artist/733f2fa7-1135-49ad-99a4-1867288cf034.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 0xf08748cde47a6390bb08e98164c7ff4372b3045ac8ade834c8fa8a8bc004a9f4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCABY1408687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d317a438795ed8d28bd9cf32efdb95c23df613954b7406a219342c2ac8fe1b2. 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/TCACH1565364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ddbd44b862f11d41a1c59bfb7564906f57853cd2c99415208430664828cf78. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCACK1508725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b739b1be8d7ca705311605bf00d5c0f1e6060ca95c55d571ecf71610cf2541. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:32:07Z), 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/TCACK1564510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645372bf3c915b7aa2df35c0e49ee62ad3f059ab1453ed8197c6298a93a799d0. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T13:08:41Z), 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/TCACL1699639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed69e5a6e62cb82e8c04b2b031208d3e18b1e846366dfdeaa4413b181457fe69. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:26:39Z), 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/QMZYR1550157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9925a87d22b82264fd21d042b5fbe13e7116c00fc91167cb8698b6514cbe40. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QMZYR1550158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe535cafd9d967989ce2c529e3322be8107cd6ab8a0fe478969ed60d4eab34d39. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZAPG1893693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864ea54e5ae4882e2601b86b19a309b8fdc5f541ecf0c3b98301d6cf4d95df66. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZ4JJ1949157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce5b794845f5bd43b4287f398cadb0f82e722d13fcc432f1474e5e7bcddbd27. 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/CA5KR1909531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79cc97550a26814129c0802e9e6cc75c873598efaa2eb9e856d1781edc2a7ad. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZES81948333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5f3d7268ee22081e130980199acddd3ed35f88b4e338b36447e9ad4412dae6. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFYY2089185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5278f74f5c9cfa3e80f0f20d7860d488ce54d3320f67937a1d9709b574a374. 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/QZHN42026225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4bf4c60d4d27c17a1aede52e8272d4befa5173bb4f5b0d65df1e24be57f1f8c. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZHN82114599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c9d9ae50c87247f67d5a192e255c392fc89da3d8916f8a4bb4516d71204f5f. 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/USYBL1700543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88778649739e81ff4c51665d86522b4fc1a46c0e698ce4f515dcd5cc9b7bcfc7. 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/TCACN1673552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00ce7d344866b203503d0f8b0d439318bdf354c260fc4dabfd9f14377c01bb5. 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/QM4TW1719408.