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 0x503f6ea17fbb6752d84dfa58d2c0677fb3b33c164a5a408c5150499511290645. 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/3d45a1fc-7e92-4a39-ac15-080c91c35704.json and https://artists.proofprofile.net/proofs/artist/3d45a1fc-7e92-4a39-ac15-080c91c35704.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 0x07c68cbeed48c298202b6c477e8ad13d69752d747287a6a0f180577042bf3947. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZDA42115328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c571cc4a634ee72284f1620f9ba1f3d010b8fe70a995ccdb8374c1f6c3b9867. 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/QZDA42115338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc41bbb3e0df6a4e7ce344f1a99e1bddceadf238d8d9cba4b94f685ef588d0b6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZDA42115339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab7aac4a2415de8a23f37fa0b9a744d84d7cd12983bebb9fe57d61d31d991b6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ZAW7W1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce19e33cc51b8c4c423bfceace69b238c3097261025666c833ca17fb27d7797. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ZAW7W1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406d7fe96f64b5f4900298c95e43250f9445a41acc81e4742f83ee18d7d75d2e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ZAW7W1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9362de3bdbaf5d3c447f231bdd48adc6cf9c28c1cc7af02e983b356c80d404. 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/ZAW7W1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc13bf29e09ff2a691ac6ba455b145f7141da5f2a6f83cee6c48fa99495bf9f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ZAW7W1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda91e665dc72d8e38120865594179ac8898124d5f2d4b3545c2c2a7a59423bfd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ZAW7W1900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4dcdf44204838cc4bbeb3fb100bba3895feb92b65996c658ed37da69f79ddf. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ZA56E1801693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47aa63de999672bfc4c94e120a54c5a8c6493ecd7aa47b040ad6328914da3932. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ZA56E1801694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3c306a9e11cc530aacbf9f427928e4092df0a04ccf82c79577c6617b58fe69. 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/ZA56E1801698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e268812feb850329351d5199dd1890cccc3ccdce0e2ee31015ee9b91179a14a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ZA56E1801702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb353c53f2069bf7ca68ff2789938059606ada9a8f70bdccb84b90924f1882e6a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ZA56E1801707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe525e483aade5a8bde64db11a0ba43310c7fad92e0e2ab41bd927db7cafe7f81. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FRX201769675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c201254c5a6f3e682e27a984176476379c097fda1996fc94e95004a12ee9c6f. 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/QZMER2097167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a4544fc9f3bc3e3c5553f0a20aed8d94034b2263502b189cfae4782a7a1ace. 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/ZAB7A1600063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f22e47cfbdb31649cd5324bb2939b5484b26ce0a80c7aee1de06e4ef445027. 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/ZAB7A1500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6ccbe73bae7e0295e30eb0502d42654be3b7fdc97dabfe5febc30c44f9a179. 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/FR2X41816206.