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 0x1726865646767efefd662a7e75dfc5020f07619b8f55de961b56ff41fb444a48. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e212929-ea9c-42a7-9403-0b6a46a20a87.json and https://artists.proofprofile.net/proofs/artist/1e212929-ea9c-42a7-9403-0b6a46a20a87.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 0x61a06adeb7a8bb577feea858ac83f1699de8b985addc50e5b2f63a40dfd7dd18. 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/TCAIG2496188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05f0a5dd11ee5c9a661065c51cc0ec66339ebf3fc5bb82c6d00a4d2e631912c. 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/TCAIG2496196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2b7adb15867de857d05747a311884ffd94d459a2984efcfc998b166be34b95. 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/TCAIG2496205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985b2be5b90f6538911597a3579dedec0240e2ff2cbbb41ae7b207683039b704. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAIG2496211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9646518cc0910d0adff9b25fbdc5e8734a6ce8e50f7e29bafc3e4238e1e157f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAIH2496213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25e86b300817670878809fcfe02d448e04401621b4569cbd545276253ff5146. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAIH2496217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814962fc7da9a73855dd612d47a43e98aaa19e61376e859768877b3ad9171aca. 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/TCAIG2496220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7150db1a63e44d9052e6a18936e1b89235608e96b2934f3328c86e05a229c2d. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/TCAIG2496222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb1dc4fc241c678fd1ec2c8ce2b995413a3a0348c5ca14d5950276f6209a2e7. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TCAII2496228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e2c5517bbeb41ccd5b4f82b01b1116e1eff602b588f0baccea5c84d1c46dc6. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCAIG2496231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c65a721e0866e6d11a9373b7490933c72d87fd0c9661f77c105b2fb6b826d69. 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/TCAJH2567551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffde8b923b874b474cb40069554d20a019e2759e0579f77114c95bc956ee82a7. 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/TCAJI2567578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63fafc49a794e0cff978d03c16b2680e6316f1510ae1433dbfbd48f9f4231a8. 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/TCAJH2567590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a2b234541f82dff4f1adfafb1a0a1de22bfa520f6b56dc514c2cbf0f2be1ec. 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/TCAJH2567596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f789bf546725982c5c68512834d420c2e2ba715f96269052f767c9e03a40a6. 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/TCAJH2567613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb961f5adc24bfbaec05b6d24d3fa2d510705f3bc1f4d9e8d2cb414ebfc260d2. 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/TCAJH2567624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644af99e46cb7e8ed3b78f37ebcbac9cd71e20cec8778e12c6b878cafd7815c1. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TCAJH2567637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbfbe5ec931b06e231d090e76cb50046c87916d15d93d00a113a1de010b524f. 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/TCAJH2567643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2236a0e3dd918935226de429e16c860f878ac2f7a614be52da00cedbd1a0199. 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/TCAJH2567648.