thumb|upright=1.3|A triangular prism dispersing a beam of white light. The longer wavelengths (red) and the shorter wavelengths (green-blue) are separated. Light, visible light, or visible radiation
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 0xc9f2586a479ef1976394ea03d65ea1dc1af0e0c893c85badfa6b7261f187e13e. 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/d49cbffb-cf51-4e02-b757-4597c37a455f.json and https://artists.proofprofile.net/proofs/artist/d49cbffb-cf51-4e02-b757-4597c37a455f.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 0xc834694d400469854b4a4360c667c3a9fef3bb5c46d5c2b8c331fa544d387575. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T11:10:47Z), 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/FR10S1960201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa011b0b87389f1ddc7803f659e3738dc31c970ca1b10bd08ea7b7a0780c6087e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:40:41Z), 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/FR10S1960202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc834694d400469854b4a4360c667c3a9fef3bb5c46d5c2b8c331fa544d387575. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:37:12Z), 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/FR10S1960201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44f0ad73e2437b035cad81d640ccd815451b2cc2a07d2a67b219b8a01046190. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:38:09Z), 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/FR10S1960200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfedd511cc56bb1ceb15de60e70846f7291b3bffa5bab061b63521329a3de93. 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/USL4Q1744334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4491e5f07c712f4aa123537e767cdce4de3ef0902b6a61e9ea1c59ce585c1130. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T03:43:14Z), 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/USL4Q1744336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa396d2f0079478488255f1cf8443900627b218991b5b368a79ac99f839cca4f. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USL4Q1744341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2558511ab9abc09db650ef946cc7f874b9c6e92301e574d44aae385e03230682. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:12:10Z), 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/USL4Q1744335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4491e5f07c712f4aa123537e767cdce4de3ef0902b6a61e9ea1c59ce585c1130. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/USL4Q1744336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbc7d30ce9188d3fcf5910103574f87853d45e9cea6ebf03221c8e9f2c2d7a7. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:28:49Z), 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/USL4Q1744338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b50380ce07d8bdddce330428fa1fd6c6a5fd466065752873bced42f1dab3521. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/USL4Q1744340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e26b724df1f543ffb332ea65e86534cfbd129c6489d11f34811813e3fc4cf5a. 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/USL4Q1744342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0073544e279df74ea9d4882b3a34144136de88b7066bbf7543c8e2e5762a52. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GRPA12200179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2049e6ea1f8e0b0fce58dc0012f5000f9b0f4ed550ee3428ebe962de0577ac6f. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:11:11Z), 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/GRPA12200288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4707fc7c51c406a49d917cf5b623f6d908006fecff10b4e3b1775b3bd67220cd. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GRPA12200285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ed752b3d4760eb0409edaa00fa68c50de188684be8ea828e1cdad559f686cf. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GRPA12200289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ed752b3d4760eb0409edaa00fa68c50de188684be8ea828e1cdad559f686cf. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/GRPA12200289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894783ed6fb74cba2c6290eef35485b9a67f229d91e9d851b8e2eb87e40c8830. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/GRPA22400182.