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 0x709aee0df3201e3ef2372d7e931522b75df81496ebdb044e2dd82cac334af361. 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/cfb8744b-535b-4f1d-a97e-a3d850a1c25b.json and https://artists.proofprofile.net/proofs/artist/cfb8744b-535b-4f1d-a97e-a3d850a1c25b.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 0x19888d77b4fe3b7a3bbe338033487dc5405e96eff8fc32c1925a9e1bd998360f. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZFZ32013359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18632230b9d0e82e6cc9794e04f626945476a31899e1c5a6fbb48cdc3089cf6. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZES72093851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0af2c508180f8d0325a04597a0006087459f8e8a0a9f8d742ad051e76ca2708. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6P2088975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19888d77b4fe3b7a3bbe338033487dc5405e96eff8fc32c1925a9e1bd998360f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZFZ32013359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18632230b9d0e82e6cc9794e04f626945476a31899e1c5a6fbb48cdc3089cf6. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZES72093851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ed87693c0274d8df467ed240e5eb9fcf29d9fc80bd6af3504ad075c950154b. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZK6P2088976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10aeb6aa1decd191cc81fd6780af08da46a0c672bcb3950fd62262c3e496dcc0. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZMER2025964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1e25976e092bdacb323caecf4d8f6f7100942e734138bf480d1befd8160c73. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWZ2043109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4c20069a442dcd6cd1c6f2d49c31e4df6d2c5fe93be637fde1db2bc5032268. 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/QZRP42139582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3823676a320cd866aeb4784c5a6469c369e4cd97ec40e460fe9aca242eef61c. 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/QZWFQ2303749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa393ae9d2a037a5a98c6965392788d12c6156d8a8a7b514ee87b8ad4232c5c0f. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZRP42306189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24eb94a33c1fd4b5e856e89778a3dd597a343cc871380d097dd70a4148f6697a. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTB32365865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc3809ef365aa2fdd7fd7c6d6ec74e355dbf3235dce7494f3651ce986d56de5. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZFYY2565117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077c2eca1df4b96910b352e55d72aa5d1192d01dd0225b503ae5894bf38afd4e. 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/QZES72585203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc3809ef365aa2fdd7fd7c6d6ec74e355dbf3235dce7494f3651ce986d56de5. 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/QZFYY2565117.