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 0xc7f3f786b02f17a7c075d4d6b1c95f14218d0321284c1e2ef0038c71f496425e. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8bff8c5a-7417-4781-9717-1e46adc1c99a.json and https://artists.proofprofile.net/proofs/artist/8bff8c5a-7417-4781-9717-1e46adc1c99a.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 0x97337457bfddc8eee9495f467cfc6395d1a09dfa57412b0b480948bcba9e833d. 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/SE5BU2586530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1311ee820f0f8b6ae44f3be40db30468132ccf28fd4e9953b71db45d0cac20dc. 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/SE5BU2586531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05da529a18d3ee04d2ae442862a8d3f69fc1be5cc779c252e260763f19d11c8. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/SE5BU2586533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e7fe2e2d21d81ca448dd2df73e3acd55a71cbaa8df7b3c9a9fdfb3dbab2bd4. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/SE5BU2586534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b41cd6c1cbfa3a9fb60de16440c60966ee1be9ece87c8b8e51d53608d0a917e. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/SE5BU2586535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8e75730b7ffec29ee9bea8258d5fee5144d979a6224ef86c990de342b77a0f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/SE5BU2586536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcccb646f38039c441934db327366964723ffef1a1986f3e096ad588293216bd. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/SE5BU2586537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72c097b279cdb486a1013ea041b5fea7b7fb400bea15f1a806afc2114175665. 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/SE5BU2586538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f327cdbcd8900e8a98172a945445943bdedad0b89da1d3bb0ba04f13aa0244. Chain 2 (Bitcoin): anchored in block 958861 (2026-07-20T10:02:52Z), 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/SE5BU2586539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1b13e892064c3f2c23a29990c63ebf2812cdd941984520a881d94306b660a6. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/SE6XY2592641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8efaa52634e2f0ccc4e54e26740e53d0f78f7b73b7017efb7249494d158fc4. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/SE6XX2523428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5916bdc43ecd7a78f1412021fc93526c4b889c090c13e538853f3376d022235f. 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/SE6XX2523429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe965f11f91e0f47bccc010a9c2e61d57b39b0bb727d752c97037ad47c349472d. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/SE6XX2523430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc523bb2b7a4e41dde7e79ae9e67c976b4193dabde5e7ea7106d5775a5dee8934. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/SE6XX2523431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe554984b4d2449edd4286bb7b7b54d3c12f6da61bf74a64ad6eb6380398f8d2b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/SE6XX2523432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63b1d0f97882eeab991323d6ff0a4e4e64c0ce546d8bef7a5e12398580432d2. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/SE6XX2523433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51aa165e90196a722eda0772e7def6b41250bfc061bd790ea84ec2bcfccfca4. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SE6XX2523434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cb445612808164fda13d156daec4d4209ce131c41956c6e5a99b0e8e62d563. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/SE6XX2523435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3465fe391fd6475f1bfdd06653e1cd20439dcc3aa36016661e4d3327585d0329. 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/SE6XX2523436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a34719efbbaf007a0905f95084106270ab8e8617d5ad1fc0fc375c43c22b809. 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/SE6XX2523437.