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 0x30b4b1700467fb9b6f79a11c8fd9c1ebfff537fc08aafb544892c415a72e4d5d. 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/9c1301f7-bac0-4f2e-a8a3-32174469fde3.json and https://artists.proofprofile.net/proofs/artist/9c1301f7-bac0-4f2e-a8a3-32174469fde3.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 0x40e9810e23efd18b56f348200a1cb80588fe03efbdd8ada03d61424b890d54f4. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/IDA642001668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2bb95ec669000a50b80f73d2906b2f440662e1e8c44ec232a4c54a49394883. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/IDA642001667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed63b2f1d734e2100df9af12e8ceeaa4a47e798c55d5156a76b30ae855fb566. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/IDA642001666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x459a8cfd67ae0b5ff2b3fa078f924d04aeee47cc74f56fe5891ff7c870a11294. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/IDA642001662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e64d95d9112beb4ce6c5c60cd2a6d89177ef411fd0e9a0cf02aa33e524cef04. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/IDA642001661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33b7a52e05c07f5a9401d2224712e716eb1a361b45bd04bfa16e0a01a6e7499. 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/IDA642001659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f28c9cffcded97e1fb4f1f28e80f12a523411416d845623a2de3e54dcff525e. 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/IDA642001656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899714411ddd9b360004bcb55477fdd3d53d2fe5d2db0cdb6a5b78430319dc4a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/IDA642001652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c2d3c40f89f81d08ba4788c978a2b43814106b94ca718cda35e53632cf2283. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/IDA642001654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a09e229af7089982cd9859e70aed7b03ac0b7f66e5f924437dddb620d42309. 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/IDA642001651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc52708b899fbe1c1cf3eeeb802c93b018febb07e9f6c1db6a4db98216956820. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/IDA832206332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce29806a189d14e2830af5859b8574d2345b466ec3e6119f82b6cbc62ab1b1b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/IDA832206331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c514a0b7c16b2ef3b3e23b67afb41e26ab5d82f93a2c2900c5ad441242d591a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/IDA832400354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1943122421fd7eb71e852a2e09a5904b67e46aad387b8ee30efe6f75f510ed45. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/IDA832402302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92e2feb859adf2b3a8ddc1f406d2637ec8d2af3297dffe088e17892cb040bc1. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/IDA832404327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde41d2de3b656499919ec2f547e7304f78f649bf2c74ae39a3b41121dcaf2e32. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/IDA832404563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d74d468a331b3c6c6434c120070879e29e2f38ed80e86ef70b34cf7e2655327. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/IDA832404562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0e9cd82b3228391564feb434a274aeb5bc8ee6bc8dca4c262a79f60666e762. 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/IDA832501459.