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 0xa624fea2de83371142b52aab19495ff841a4ed7ecc25212c837c834b0abdea7b. 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/a663dfa1-e688-4115-929c-0f253111249e.json and https://artists.proofprofile.net/proofs/artist/a663dfa1-e688-4115-929c-0f253111249e.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 0xf6d22c07eb273673ee96c55698742a4753878f527dbc7224ca23e2c752a4a6ee. 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/TR0350600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697a02f2d31ab4200390e791388a88a6cf8d81fd0bb1ae13230b61eea7f160c8. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/TR0350600060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9aec4db0625232d7c1d0de8e34a8063985e0c508578223b8bc84c8a0d3a232. 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/TR0350600061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87be7b448d89dca1447d82b00cfaad5ed694746768e4131c9e5d76a25118b803. 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/TR0350600064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888d5fdab0187027a2330941ec0f65cbc7719eef7ee1d5401edd3fbc8471b4a6. 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/TRAAA9600963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aaae2592e90ecad0dd3e44abae88ec8c5a36dbf1e9894cc0e97a8a07575dbc0. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TRAAA9600967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ddc121ae80ab5a19667090f0d76e892d848ca7fc204b1daa064ed66a8faeb1. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/TRAAA9600968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ee93a31cf0081f8c0d94d3ef873f8f7bb278985b3ca18acfd58cfbbbd54a5a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TR8571001672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819bb282891872f04dc4b4fcba00a56903e3bd2930cb8820af18f4d333fedea3. 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/TR8571001673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8527ece5909660ed1456d59ebcb1fad14cbd81bc709376d2c94cca4324f9a47d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TR8571001675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b7862460c27aa10b7960f2b77271b0972648d3eeb66712133ddb052e10df41. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/TR1660600316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d6ce97a1cd21f41da54b4344036d16279aaa417e5ee21652739d96bcdd8e85. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TR1660600315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882ffddc994cc866d12dcb1726d1e5da8c58cb09a332c562536ccae3b27d32a1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TR1660600317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2341046e0fbffcb3a9a6d6589cb1e24bab3ea65ecc5986b0b7af3ee43bcffdf. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TR1660600318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1efcfef1e5de260c0907ce2b60244ce8277bdee4575749bdc1b31974f28e1c. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TR1660600343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47c2a9941c68a2013f330d7482ca26e27ea422b797dff92fd7a248c4169498b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TR1660600340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5d4fe6b9842c3b508560431f34f4259650800e967a80d52ca5cc2a38bb0d3d. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/TR7741600124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283ab642c6369503df9c9737175ac83b9731a84d5d381f849e66e1e77c2f40e2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TR0080600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4537eb9daf2f0ca7307f84997942b251880d65dcc888f40cdfad971f55707af. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TR0080600023.