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 0x0358431bfe77669819b56740bb2813a563606d9100fb2bad92dd4aa727afa4ba. 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/9e53d5b9-3513-4974-9fdd-2c0fdb01677f.json and https://artists.proofprofile.net/proofs/artist/9e53d5b9-3513-4974-9fdd-2c0fdb01677f.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 0xd4d3b94cc6dbd94bc55205f31fa38d8dbb7fe94ad16a9e1d8260ae5587e4fb32. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/AEA0Q1845637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f7b33a2387e97eeda0df7c484655850ffb0fa48d026e99f56b741a5633a949. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZN882127019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d8584956ab6682c342cc944c9ba26d7ba2a8f81763d766f52e9649052e3454. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZTPX2485030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311ba9f84ca115f4b1811d066aa35775295cf8c280e81def8af6c7924f8d68c4. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZHZ52060814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb275d38b6d4d68e02c3ebd751330b01aea11a89036f6510d94866d86792368f. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZHZ52060815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5202b899f83cba341370492e513159df52cc8221813b6f32f8477f7fc725cf1. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZHZ52060821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa9eefd21a5151d35eaebd074da07d098e067fc8a7a6a0031a18399f37b25ff. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZHZ52060824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aee286ef5b2b77ffcc6eab26850d20288c2bc85e66e6d3273d8b83d58e97e1d. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/COAKK2000339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad83cfd2863f33220d7b9cc2e65ce4b63fe8c9c7fad3ded50a72a6dffbbb902. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZ5AB2346963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c0a3f3d5c8f47795e8de2472e244e7444e78edcd2562f0f7a077cf39b4eb23. 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/QZW9M2309810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbab6a3a223af31c816d4cf4befcec0cee4a57951920ea4232ffc313b916520a. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZW9M2309811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920a8b72dc3557b118206c7559024df521a6ce9a5a68f5fa3b9d217e7ec8f70f. 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/QZW9M2309815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5630e6a12fa4f840903d1092e99adfae882b69e75e9b859d9ef2b1e64dccd54c. 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/QZW9M2309909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6160f61ab1e43a6d2f3f3baea888a6d253f05d7494290120f3720b34a973624. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZW9M2309910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba215eb91b26139d32555b67291c83c543d50e66ef68f08c26db046fca73e86d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/COAKK2000123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1438ba8bc52b74958bc065b69151c72380874211bc0f22d2df3ea695b4a11be. 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/QZNJW2520658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3007a1e556c2a0b2d740f316efd031be90971235e4b0108538f558824cc186ca. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZNJW2587680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb76e529432493d8c788de32a2190009df071175f5ab30fa8c3964cb08a82acf3. 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/QZNJW2587681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf342df8215e197ec33dbd2c1b44f71265058677d3ce535fbd19a6198f9cd8fe. 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/QZNJW2587685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84550bbbf1154d9e16b14febf46bd2bb6afe3656c1601e79c6d5ec7ebcb4091a. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QZNJX2501199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1438ba8bc52b74958bc065b69151c72380874211bc0f22d2df3ea695b4a11be. 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/QZNJW2520658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcc3a7ecea0712a0d8957aeed6eb7b6ff6c6e0358dc100c1d6e048c2e73240f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZNJX2501073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707b8ecb6a6a441d4f5ea53bd08a533641cfca5803f77dd767e7d002c3ae2b38. 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/ESA012032002.