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 0x8077421f099d25538650379c123b9bf6c8205b3311c69fb655fd03f47ed3c5c1. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4fc5d8e7-529c-46dd-b843-650477f7b7d7.json and https://artists.proofprofile.net/proofs/artist/4fc5d8e7-529c-46dd-b843-650477f7b7d7.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 0xfbef9e3a50f33135107fe1c9e37886ae62feaa48d0953a98dc01f7ce8525fa3b. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NL8RL2461120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c72ec8a76916d44bab0d2972df89c8e52b53a5e7ffb9f174d4fce0ec183452d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL8RL2461121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ec3295df5bc5dcbb0d23f0292f3caa35c6b96eeaac23b45d3388bb7a6c4cd2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NL8RL2461122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561d29486815894870a9e89fe6dba0e448fd81d7e0aa259d889ab4ac27263a02. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/NL8RL2461125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee3e3c7ed71f6237f2868ed90e78e38ff1b73b6c84a4dd86b3e8010fca6cdd0. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NL8RL2461126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4103cdce0c8906e48bc06543fb380ec77a0b045f1122bbca1748adf7b36ac32. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/NL8RL2461127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc62b90ed810b9f6f59ffabb1c258775366e29c0faa6ce8d901ab7b9924e317. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/NL8RL2461128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e5a8c46806bce158332cb6863ed947b3c6a9f73519edc9336c6b3a44cc5e40. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NL8RL2461140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c0f147a2aec5ebe253137931df23ec814ac592e780fe0d0bd5c0721cfab11e. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/NL8RL2461141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9a316a6e1b62f1cefbba3cfc97612e1bbdf4e276e1090e17cafb02d93a3fd3. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/NL8RL2461142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a9e335dae77a4f061311e1167e0cc40b9ec8b6f30db3f5c9b5fd6cfc8ec5e2. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/NL8RL2461144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed8ff5df17e57af01e091247a76c51ebea6fe92447490ad1f7ebfc977737525. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/NL8RL2461145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4982ceca85c438cd0454d017f6d01f7d8268587bdccbfb57fc960ede09a25f9. 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/NL8RL2461149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a661227fc3ee450456cf149afdea8e725136e1ab6df23af78516c32e61d4ff1. 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/NL8RL2558163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b809cbf5d22751732307419f9ad8f8c2a274d73e054efd3e88c7cb3a6f0d0e9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NL8RL2558898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14a06f905ca6b4906b9207ad134ac530c1c26c1ef77a2503b84cd6d3eb2933f. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/NL8RL2316639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da599b1b05dc31eeb72528da7f52eb0ee7983d23b29edd438d69387d7e7b957. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NL8RL2316640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2ca09806a416e3d3687dac4589ec5c671e81de680aa20e0bdf763a7f3c09a4. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NL8RL2316642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2476bf4cfcd2f1033138b00a2f4cbd7bf6e5cea25d91c111a33043fa56daed9. 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/NL8RL2316643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250697aaa5a3016b4e115e29bb60e6c88757c40528f7941caed55358dd8d79ac. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NL8RL2316644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01292b1a9d5d3007fe01b09f3e87e3bc16770ee38cd6bc8cbe6e320f9c9f48e2. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NL8RL2316645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3a72f64d71b776e2cbbd8a929a385113bc25ee0b64644004459f4cfac267ea. 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/TCAGT2368774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fa81c90f67ed2605781f3fb0bf1c10d9e570b6f1cbd80bfa647d05a88c5d84. 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/TCAGT2368784.