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 0x62b89ce045c8dd9f3d28a272164ec35f7fe4936419dd10d177c5a87912b1e576. 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/f1c50c0a-01fa-44fa-91be-1c0dcbb89a86.json and https://artists.proofprofile.net/proofs/artist/f1c50c0a-01fa-44fa-91be-1c0dcbb89a86.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 0x11387a7f58a95122f4a16fe51aaeb70d4d35bf6778f05e26ce4d173ebd420f43. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/AUVX41200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f75d35c2045dcb7719ceb9271fccc1d80e04fb8173b8532f54ee51895e5b55c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/AUVX41200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5357ce707490b88d24b99dc8df1341de1c3a2cf5dfe53492ffdaff9f53122af. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/AUVX41200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f1aac2d7301f2385d04ec245fc3d8a0ad1b8ecaef614d5c8ef3b8f9a6cd0ad. 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/AUVX41200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c73992c399310bf8fb6f5f8d46f2b626d2ce0b1727b38e233468c4c3964854. Chain 2 (Bitcoin): anchored in block 957702 (2026-07-12T12:25:41Z), 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/AUVX41300049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5468fcbd520631550d8bae4c47bc9e0e3ba839f37164c35d22b25e9b8bfb6f7a. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/AUVX41300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623161c22a3d071c58a6a843b051a2752a4069157f35711c7798a28b18f2890a. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/AUVX41300055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec52f1368e967eec7a9bd8fc4a1fb7d1f65dc111cf0edca514e663be5a596a5. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/AUVX41300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e149bbcfcca580a49e37ef296f587b3d92022e84e8a7a77c3df431c3e86f053. Chain 2 (Bitcoin): anchored in block 957699 (2026-07-12T11:51:06Z), 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/AUVX41700193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e149bbcfcca580a49e37ef296f587b3d92022e84e8a7a77c3df431c3e86f053. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/AUVX41700193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b64741447a0e4aa72b5b8f093950f52133c8d6b3950e42022fee41439da6daa. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/AUVX41700196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde243dee499106a038c8e7a4f3a0f86d56946a25be53f74ef302667188912bff. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/AUVX41700197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685fdc39e748c90c496d4c8a0a1fa69445bb46ee5629d2ca8bcfd93cca13ed77. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/AUVX41700199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77aaf54ccc82fdcbe178daf103acbae704f409a420fb8778a936f5752dff34c0. 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/AUVX41700228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017df39286ae17fcc00a86f61b9e3f7e466e98b26e75dde9a1824a54a47b5a37. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/AUVX41700230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7194f39cb29317a44a9b2015f3951d4f17bfe04d6b4e767c0041daf20b91df40. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/AUVX41700233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099e315819160a991f6b3da15d497136304f568d6f1d98e896e6e6e78db90afe. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/AUVX41700235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c42ab41049959981a58acd84e91c23e9dd59ac3cb07f95ee3b3bf8543160e0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/AUVX41700247.