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 0x9d4a40f4a173f24d4b52e50c020f95ef69550e6e9d019a1e933f8b2b5a149465. 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/c24df6a0-9a5b-42ee-a833-79e9e16d9430.json and https://artists.proofprofile.net/proofs/artist/c24df6a0-9a5b-42ee-a833-79e9e16d9430.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 0x7762f003e20361c44634e4c3defacbd23750159b7ac58f5b06957550abced969. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/DEPI82323131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee46e4e4f6ac2be32970518e89d411bd154362c87874796907f4e8e9cf4fed3. 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/DEPI82323028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90e10c573d5b851c70b87a02540e7269e5b7c21e4b5a2e9b0170bad1ccd56a4. 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/DEPI82322994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49b38f6db1d109331693deffe40380512d9913a5f1bf401b7f7e7502fe0dde0. 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/DEPI82323007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7112bd4ba6f15c52bedfe91040f0e2140367e3e5efb89c995c549c556d94e87f. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZS632384189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87bdabe4c59a3558b8596ec668870bcbc641036077b939f11050e16bce168c6b. 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/DEPI82323115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7b7ae065e8e934dd6582a13caaa80e737d520d28082f7a2c351930729de61f. Chain 2 (Bitcoin): anchored in block 957579 (2026-07-11T14:35:38Z), 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/DEPI82323053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709b677a151568b8a535591566d8f5ebaf5fafb9fc90675c50f09390a06e4ed3. 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/DEPI82414181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8dd2bb95246bb47be8b3b74199418bd57186412c2fc4262ab2ea9c9ba0a7b49. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/DEPI82415986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3d77276bc93673576ca6888054961e2f448c78bdc9054e694f5fc3d850fda6. 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/DEPI82500032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cf4a934f6907765695ad1d3314d796898c4271c34d5c94d0196167850e9dcb. 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/DEPI82500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbf98f4aae9cc0190a82f629d150a31d4a50278adf821c30f591a70e39fea08. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/DEPI82500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d2f4c802ecaf3954e1f871a5e65b6076ff54b34f60a327bc3b8fcb28b83677. 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/DEPI82500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd8acb90c1a310227f01797886009cbbd4358c1dcde054ce64c437d14f9e310. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/DEPI82525450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a24c2cab3e8c9d37a4e5e527235f000615981df9eba75757f1a5d2d6d62e8d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZS652492432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bc094207c8498c34157e4a95477644a4ac8ded49867c907c0d05d5d6abe7ff. 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/QM42K2445531.