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 0xffa0d3a986db49f44231a10b057f13672a25193ed6d960f1902879af72be970f. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05dd2d9b-f844-483d-a28e-9bdc2be35f00.json and https://artists.proofprofile.net/proofs/artist/05dd2d9b-f844-483d-a28e-9bdc2be35f00.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 0xcbd42aea088dea08422ecef67001a3112e77f21031dcdc47e5fdeeae4b37dc78. 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/CZDP92300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9957d7d116e5b8d31ab732752edc4567a317c6ce5fc158140dff6cd8e2dcf78. 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/CZDP92300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d0fef3c21c408aa9160517e5028e5026f990af7e44fe143071cd5eaa1baf67. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/CZDP92300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cec4b7849cd2befe41bdc4db2af46e5ec28e1e181d6e28cdd42b807ecb7bf97. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/CZDP92300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcf3ea957c752c765423905a98e6add9e60bb9fd079c862961da632a1eb85f7. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/CZDP92300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3802f645501f0fae0c02df2012d57b5ae62b2a56e9d73803841ff8a3176236. 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/CZDP92300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c4b90bda383edaa3d3205c74db1b8c2d344d3a0bf4ffbd8456946c6414025f. 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/CZDP92300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34739b3eddc7b9e7e7f47791a9507f89047d88bcc1916d8a8da7daf35b01186d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CZDP92500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34739b3eddc7b9e7e7f47791a9507f89047d88bcc1916d8a8da7daf35b01186d. 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/CZDP92500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1220dd325f5adfe0bb0b84c1b527ecefe94d99f8c45225843bdde910d790fa53. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/CZDP92500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad23b5299433eafc1fc81b8bc5cebe90c67ad43dfd5773d4bdea44cef1286a0d. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/CZDP92500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec8382d2321c68fef6247030667d7269c40271682b04acea797aa50aad200aa. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/CZDP92500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f53be480a28b3e3cf7945b94732b2ad20de81309ed53942a6ce948851bf4d62. 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/CZDP92500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb325068a44c3c4f5f43dfd3126bb001992dfa2f578d3439861e8c8207c015a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/CZDP92500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22667683d23317b4529f9cd802816605e17245f9edeecce2875e0f5eb808ff37. 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/CZDP92500008.