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 0x17620a63aa8b1dfaba2d82281a6bea7f1fef60583e8e4dce27507b04872353d0. 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/e1ec0894-ed5c-4646-8149-15eb25eefc42.json and https://artists.proofprofile.net/proofs/artist/e1ec0894-ed5c-4646-8149-15eb25eefc42.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 0xe2981493001404a5236d9bbe7aff6ac269bd51b7e00728a27526433afa9faf64. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FIHYP2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25859fbfc58f7e5c84dd17f3275633b4417485c1cc40cfd52e2c1cda31c8511. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FISOJ2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec50f26b656876271da72231efda2c69a4a6934ec4bff9945f30b43ec4f8aa0. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/FISOJ2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec3249db52f16e957025ec9a71a9692960ed3e9ac3726f459d833cca7d59a77. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/FISOJ2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6d0f22f608080293e4cf4b3ae7068e4f1e14411e0803dcee636cc31e086c83. 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/FISOJ2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81bb58d4f18c1fc8d6c0771a5152a7ec72dab9f24dea82b0ddd74e31740ecef. 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/FISOJ2200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344eaa7c5857f3ce2dd0063e01927ef86b217a6aa515a3f59a12f8c059a7547c. 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/FISOJ2100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e1613e466a13d83b256f110dc517ea60af9a64baa72a6f10dfa337b7a91f17. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/FISOJ2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d8a5b99a4e4abdd33efa049f8701dd64f056c9c41cc9dc47e9da3fd7468066. 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/FISOJ2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c600f0d29b85189abffd0bf7df10956082161f0014e303bc0fc6848aabb7bbf. 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/FISOJ2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0cb5d76965cf6aa749f59b4582b9c8ef055472357b7d3b14d9f90781ff58ba. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FIBAR1600480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b3efa87963c74eae1de18edb5f6280d1889a655a1f27e5d0b16777e7f487dc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FIBAR1600519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a033ac598385045c0a15ade09b55a5a1683be6996255e3a9fc68e6b65e860d4. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FIBAR1600520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b0fb45e9160c326e8bcf3c56e0be56cc7c14d4e65038fdd56aebccfb56d358. 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/FIBAR1600521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd43b0ce9109dca87b00a7c911588b37be30795e49a61fd267acf68f48b1bd95. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/FIBAR1600522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665f98ea80a1393fc9dac201b0fc38c48441a8d2f52b0335276a5314d453cc1d. 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/FIBAR1600523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64f3b6fb8697b6267e3a2f9ead513b63ba40524fe0b5730d598fe9f450e7435. 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/FIBAR1600524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7334ccb376b736fe16c69f6fdacff482d81cbd47b3f403fd3d339c8460c24b66. 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/FIBAR1600525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5044319668053b1e25674aaee70f6a5e9a1c9756baab914914773cf3713e11ca. 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/FIBAR1600526.