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 0xd8075956df018d705952a52eb3b251452fb6321e3c71c9cd674799ab29376192. 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/e8ff1497-7719-4021-b816-07baf9ccb7f6.json and https://artists.proofprofile.net/proofs/artist/e8ff1497-7719-4021-b816-07baf9ccb7f6.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 0x0d6c5e00ab86f5ccf24ce6dc84311a7767ce5c9d8f8dbbe6c652398b251713b0. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/UKZGC2200566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1979ccaa318c3f2139548412a99e8c67aea03ea349d4474533458a530caab779. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USANG2217025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10e3433c8edfd4cc1b797ed690cbe7122e74c37f803a59e0b5266aee8689750. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/USANG2217028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027f85be142c2a4bb658e8d28a6354d7bb614b518bff9cbe7a5e73582e8721d0. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USANG2245431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc674778495c2191338d3fd9dbd978923e5691754200acfeb18c0134685b389fb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USANG2286947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b95534323a4c8bd5db171a5af43cbd22eaf981bf082666c6abe63a13c7fdaf. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USANG2286950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b1a026a99aff6783c55ed4bff77039b24def7b9cca11415c483d71d475da4c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USANG2286946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686d4d6be24640ff24fd2eda56434b90defc26b65539b6cee314228e5eaff7e9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM3DF2262877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0fad286fadc5f01b2112da98e47cfb8e854e02bb7a862c675b2d740d8f2231. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QMANG2235822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174abb780df70045e45b9626e05ab8e158234bd2887a7beed808e7f0d2d3b9ee. 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/QMANG2227507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb7f07e77c774e568d2fd00fdb3bb8efb3b82ddb5d5f87869a18244e9438538. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAQOI2402059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be17375dec6e6724e1dc25f8c6d506037c419bedb2a1664a28cc9c40aa7cfc8. 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/FXR752401584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a63fddc9483f6221525b6a0c4630a5e6378be5c9a872717cc101f5f183638f. 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/QZVEM2399508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ce6b20a32eb1c6c3f85b547cf79d9b97866aafcb6d384c32ad9f6656cc5514. 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/USANG2449095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a06398ab0c515d98fa4974578ede5b3805d145c45c63034790e50ad6ce0e62. 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/QM3DF2280064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ea72096f641e5a7929a51b405a4dd931ee2f3c730273f2397c659acd6c5418. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QM3DF2278311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0650b8b0a3528dbb485e0ef896d0fffa5f0a13a4b3aa4aa9062b8d77b9183bb. 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/BCD4N2300161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52e79370d3bde83dc9df170d0a71d7fc35d972cb6767119cc74f3a2bd062c62. 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/US3DF2494204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0650b8b0a3528dbb485e0ef896d0fffa5f0a13a4b3aa4aa9062b8d77b9183bb. 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/BCD4N2300161.