thumb|right|A former warehouse for printing presses converted to a loft apartment on Chicago's Near West Side thumb|A US-style loft; the additional story covers only a few rooms, leaving one or more s
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061d00f8e5d8281395e5795ede258254eb0ffb93f1f552496db3cb73aa3cd76f. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e55cf752-cb04-4820-95be-aa846675dc8e.json and https://artists.proofprofile.net/proofs/artist/e55cf752-cb04-4820-95be-aa846675dc8e.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad709041a35257a84bbd1c4ee181cd6b275842e69ee333dbd1965da35b7500d8. 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/CHG052300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9f63b91acd0efb7c1485719ea6255f5bce44e80b6591fbdd808e052bcbd978. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/CHG052300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ab223a3f378df1a051dc6fcf6608e0b2a76270d740c658b77bc881e40c6a2c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:46:47Z), 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/FR10S1639926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087f17c975c4741c8a0f376564fae704262c59a277592a92b4936a7d4c710f43. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:36:47Z), 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/FR10S1639965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f46dbd50b91b92708d0b1167a321ffd8cec21e2fc9b9c233ef675b95296ec0b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T22:04:23Z), 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/CHG052300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344a1ef0dd193506c567fafec0603c57d30f46974da67b2744c109d5195e3693. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/GBLFP1721725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b03f6670a04c9f961e8008a45648219307708a9913ef82ebeb0d077fce252b. 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/GBLFP1721675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c1f0aa5e13e33da453ec619f632d7eae95d94344ed4a9fcfc423c5b1809f16. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GBLFP1721633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7c2b5dfdd0669a9f7c69aea356f7543476c4abbeceee47465cee7f399c60f9. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/GBLFP1721667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488b06bad4e3b2d536ac8ea23b4806cb536819d5478e19dd90dd7c94f02c7a45. 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/GBLFP1722930.
Summer Summer 2k21 (Experience of Music Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b91210e6296a0e239beca7c2f5997837d9fa36e79bd1342a4c257008dfe0050. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:47:30Z), 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/DEVS22201147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc284fc752e1569a886ec6c479ec2652f45678be465f720164ee433e9ab3772ea. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/FR59R2502802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b44903c9b2ee3a6d3bcd79684e39fa2cd82470ed86b05d5469ea8b0d82f814. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/FR59R2555980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cc2f1d9df34d47ce242a6105d5dd99fbd4f87414bec5dc041989b895e4392e. 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/FRX282517882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b093ff6aee62d80e2b7cdf4cfc472f2a84562e40e91e12af15b7155d1887ac. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:17:51Z), 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/FRX452540508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a889583591d7a92d0ed633524c43480eca1eb675215b39e80979f28b5dc4986. 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/FRX452540509.