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 0xfd88db7b8dee23459f90a0bdc6d787bc75f3f7df021d1f60a2fec09acbdc83b2. 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/2e0e1ad6-f1d8-4739-b755-a9fdd88c3b1b.json and https://artists.proofprofile.net/proofs/artist/2e0e1ad6-f1d8-4739-b755-a9fdd88c3b1b.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 0xac40079d69c27a75ff43e6b9eef723a049f6d4a07b896bfc356ae49ce3b56e71. 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/NLRD52256632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4538c8a42e92544035116c2b730a0aca2fa08246bcff719c2018e63c3dfd1c1. 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/CA5KR2417878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1006fae789ea7498da1e8402dd10c2a7458cec47fd77b4c983cb19d11f65c2e. 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/USDM32244601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe3ab56ec98e2fa90c67d27126c5a5c3fe1deb6596a6520f038d8e11c918037. 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/CA5KR2083857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde981fdcff81bc26ac7704df7e408d44c27d362c3ae361862ecc8162b2ea8304. 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/CA5KR2083858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7c538bb77d10f472fbef1690ff815ed5dd11c0f19780edb278e42188a1dd5d. 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/CA5KR2083859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7bf76f4b176f98498ebf1b1092a89bf7fb580236cdf101492684a2ac9fb228a. 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/CA5KR2083860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5454f2a26aee2547988c8a8c6af8d727f8a0f84060405c63a5625b0cfcdae74. 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/CA5KR2083861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe658ecc2df97246779bd53a21e71546706b71531d78806f80fc2c348f74baa0d. 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/CA5KR2083862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1f8545d5621c576789fe139842d3abfc7c963aaa5c26ab317ee88216e5592f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/CA5KR2083863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45a771ef21bf4511740759ad4c52ccbc148ce2912f18f26c74f7ff60fa6a771. 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/CA5KR2083864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc562530878077ba43d87539179e701ab4e22b3ebfccb6fa8ce2db6ccdcba626f. 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/CA5KR2083865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f194710f19e6c8c4051a695980fd90ad11596832d94846c1449d7e55460343. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/CA5KR2083866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72dd352acccd735a8b1db359ddc67403a8a22633c6a9902447a9be66153b214f. 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/CA5KR2083867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a69581e8c0f8da731bb36c7880122f1e50ba2f729fd9601eeed628fe6147eb. 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/CA5KR2083868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfb88b11d7b8d6f121163f2f80866e7edff038e36c431e6df8c762d45e2779e. 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/CA5KR2083869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05a26b9d777e485ca66bd7c78587e6e407ca276d49592f2e1f0d16f911c0773. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/CA5KR2083870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x757c086c15bdf60336cb056a35b671f35a34997a546b9f5079d6c1c412471330. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/CA5KR2083871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec26c37f745030660c9411c8875c543101b8d764be27bd9634b6f0fcbe9e7ec0. 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/CA5KR2083872.