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 0x315bf3a5a51b89117d105f078b620f4dbf43cbf69029ce4f125be28a69e94ec0. 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/3dcab903-1fac-4384-99e8-7278ac695399.json and https://artists.proofprofile.net/proofs/artist/3dcab903-1fac-4384-99e8-7278ac695399.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 0x01df59d414bcce4f19fde6d33c61f1d3e6396c18c46d4490252bbb3698824dde. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHN62067578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0facf01b68c21010eec12595429d3ef67735d0c32c1c6c1d1046d0dfa7540774. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZK6J2028393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76976df6bba3e7555e29f3b8f921e00f16f00553ce739ba239420e458732e6bd. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZK6G2142237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc656cc0482003776ad78e92f4c2f4e9fe94a5a2936ff2bc60d3b27187435ce8. 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/QZK6L2272780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6564c53d03063b333824da9d63834b25937f2817b7ede0198dd3c275a26be8d2. 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/QZNWW2246044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30aa0471c1b7d5561e1fb0e7e80ff71b460f45b837c5c332364cf507228b2b2. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZK6P2343163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26eb66f0f784f338be756f3eafd343a3d5606199848815e0da60ec30fabbf7c4. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/QZMEN2306005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2597589f21245e220ad3005b95b48cf76e47d074a37c758a7969df6be005a807. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZMEN2306006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276a588949e34000e7462e9d2a1504886a057c68c61eb270588be69dfc0e5baa. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZTBE2322607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3aa7081ba2bce3698467597abcfc3b0104b515e7130abfa58d1bbb80e88ec2c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZFZ22470989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765b2d0342ac44be1f10418d3b56c4ab79c5509dd0a0eb4d771359b8a1f1f948. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZMZ92467958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a72966caaa9de518bf551574e998810fbe824f9839732aeecabe1c61a75dbb. 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/QZTAZ2466217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ec284e0f5a61e13fd88ec2773eeb40bbf7aa5cbd06a0df73eb13a2e6070de5. 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/QT3EY2411549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ec284e0f5a61e13fd88ec2773eeb40bbf7aa5cbd06a0df73eb13a2e6070de5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QT3EY2411549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb5d6d299802d046f93f835129add232436b8242a39c297b8e950a20fe764bf. 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/QZES52537959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ec284e0f5a61e13fd88ec2773eeb40bbf7aa5cbd06a0df73eb13a2e6070de5. 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/QT3EY2411549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929a0e16b200eb016677857a9dc656227ffaba2685ec20847001835f242024e6. 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/QZK6G2579256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24772f34fcf9c2bc007ce52fbb8f8647911586e22a02d644e5357e8a50cb3c18. 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/QZK6G2579257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367b53e9ad9079979db6d878a053adea74f6dcaebc4e40aa11abd2eb4cfa2cb3. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFT2536472.