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 0xfaf1d72f6a1ce1471628e636c49071c9b87c67f160348666907b47202849606b. 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/0e67c46d-6a26-4e3b-b144-dd2350a3c1f2.json and https://artists.proofprofile.net/proofs/artist/0e67c46d-6a26-4e3b-b144-dd2350a3c1f2.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 0x1b2420a28939adc0e2202fad1c17da1f95064f6633f187177dd4b328057126da. 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/US6R21483226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023d27cabb4ab92658aedff830a8ac404fa9c0f22a0cbef743505587fa89e028. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/FR2X41751620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94183af105c5a158b00f771824160f191b768e0050c8c06ea9485a3a68f5e16e. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/FR2X41751622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x416624e0ece1a41a95300a57a52a17ed08e4023315ce04a73bb5d7705799439e. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/FR2X41751627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408645fdd4208686deaa935ad088997de0e9f00c084424286748d6a4092ea2fd. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/FR2X41751628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4dbc0e9104d7cb8d30e222ecd01bc80dd4d17645507b21dddd4cd21f3b8764. Chain 2 (Bitcoin): anchored in block 957661 (2026-07-12T05:37:10Z), 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/FR2X41751630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3f4c13d536d8cf0a773247d64a6a9973c1960a45cad8ffcb0cbbdda8396b9a. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/FR2X41751724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc6254fc5778fe4646d94496045b451e14edbe2c9869ed1683f58e215f3a3f2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FR2X41751728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe419a1501674487fb8f1bbf26fa6cd4589b9e7eff7617b30f33b7af39372eb2. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR2X41751729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd24d5a6ef10b2c886eeec0b6dd38a0079ba71443b68e2de0a2dd8a4183e27d. 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/FR2X41751730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fff25e058d309f41de6a7a94a63eb2992048d2d2052adf87f8aaa6e029d9da4. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FR2X41751732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5784c8ee22622a8ac9cd54d4349adcdb265fcb5b0dec90a2e8c3b2028aecdb29. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/FR2X41751733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f94e204524615416b7a98fbc8c2a625e08c0569c268e52b6a094004c4c3ab9a. 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/FR2X41751720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaec916f8e033d7f954e39e2caf549ecb3576142fa2f14ecfbfdaf3ef6f17780. 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/FR2X41751727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97a09ac5630b9353a40334a5423dba5db405c00d6e2271d4b1923d69e25bcb9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FR2X41752400.