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 0x1ff637e12bf043a6ce633664d77e975fab058362e8594a53e7b72304002d8471. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/85db6703-3d14-4c91-9a75-9a9a20f11128.json and https://artists.proofprofile.net/proofs/artist/85db6703-3d14-4c91-9a75-9a9a20f11128.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 0x7eaf9424b9bef2a08c42f473544b04fbf9a5c01035e68cf4093a56d6f4bcbb05. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/TCAIX2418146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad179b52b7934fa2bb88cf672f1b6dfdcfdced5fc9e2a825f9fe808a790c6c0b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAIX2418268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640cba4f5c8bd9068352720be425257f1cc1a71be339beb6d763eca1692faa63. 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/TCAIX2418281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ae92c44e67563187a47bec6d604e30cf9b2c4e6823a5aa2afc0ebee153a7d4. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAIX2418296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7918e5adf12a6506cc1c6a68539a9ec8cb992bd98cc0046fa7a6039c7b5faf9d. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAIY2418306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d5cf8efb78f0dd55262212a54bd90103d446017f49c564dfe995ee80c397e4. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/TCAIX2418316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e55ff444acc56beed4a8d7f52625edca0a7cf01f76d74f931d5aa2251fdb0a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAIX2418327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c8ab86a29c8ef4737ca9eed07c6e08f952fe9170212d5bcfdf8366f73301aa. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAIY2418335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf2edbceb45a6b28a4e355f3800db61386116789784b088340dd5e94d0f0a9a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAIX2418343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6166dc5f1f85cc94afebfb378f6902f78b76440a63bdadf6bdd3cd3e5494db. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/TCAIX2418361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe073413d17d2aad4c1bcdc7e30e285834581e4a0cd0744e489da657b91abc0d8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAIX2418372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8591e32e3c678b2ddaa1d3657e6571ad0b71af89ee5b301a84905d4a6124c1b7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAIY2417478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1e566118235019eea017c0b8987630161b00894255a243e6bec2d73f232755. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAIX2418099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f203cf9ac883aae4ee018d85cb1e6803b0579ea08ee53a06c750fb25044bf92. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TCAIX2418190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902c483f73fd0f726bae0f4a1a2284f4c322dc86f972c652e59be5956e912249. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/TCAIX2416928.