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 0x632b2fb7ea9b2dba9971e1a935ac42db409215d504d3d632960b75d48bb69f44. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4738a01-fd2b-426c-a8c6-10b20d6e38a8.json and https://artists.proofprofile.net/proofs/artist/d4738a01-fd2b-426c-a8c6-10b20d6e38a8.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 0x57ed6d3ab1a3ee15b19d34a14330d05f54bcf08c9c3103e9117ed48b7f96bd4e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US83Z2137713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2833a6972941ed10d93a0907180f409560eba6121993939826543dd49305515. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US83Z2038445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac828e48448e8b89954c308d83b50b372d295def37a5701c67a79b3899b5998. 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/US83Z2215825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e717bd64214f12137f7519ca9fa810822ce1538767f571d2d406b58a97760d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US83Z2215833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929db043bf4af5514e41ef1cecd5b223616b39c249a70558a6fbb7bb6aa9404b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/US83Z2215859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378fcf7997b9daf39e18ea5cdf177d8cf18321826f8395b55e81846620e376ad. 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/US83Z2215826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2eb143da1dda77f38d581c5aa3e9137d57610c168b6f3d95f2b332995e39f3. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US83Z2215836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9dea8322b9bd68fc77157cd11dfeebb1367cebf11318f40344124a7b5c44f8. 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/US83Z2215837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b90c5fc45bdf3e74542bbfe1ced8af072a4dc944d384ce711949ce47f82dc84. 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/US83Z2215866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e7c24c32c2dd4bd90ea22e3feb9a54c5b4e52a990ac736e6b844bbd1cc0ae6. 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/US83Z2215850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803dada49eb7724b99936c29e06ba9a1e92ea8d83ba2a8ac3126043212f79359. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/US83Z2149324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96e0abb752fe598af356c7edcdf7bfb49af453be01324bb46109752aae4c94d. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/US83Z2149361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc35aeec8f6798367e61467568e3c21a63cbfbdba2cca52794956613b6a9eb2. 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/US83Z2149327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867fcd9f530aefd27bfe56a709c806987fbe42ee0ce5666462832f2420df012b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US83Z2149329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99df00f9ccc0f1b46798ed0c38b934f5aad30253e2baaf10d41478fbdee6c766. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US83Z2149345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e494272cd5a65ec504f237d6dd287db367f588f08fa1c6d0b375e3569411a65. 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/US83Z2149326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e97032ab5dd1a27d9ee51c40b922679e2784dd0f7a5bd4cf30619a75a2b2e50. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/US83Z2149357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c770dbf878d35b295b82d775050d670b784a41a2def0cf0d8c4be75ce18e2f6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US83Z2149351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee8b67abb4d0b2bb63b8a2e268366e88c0c7679f2190a2992d580383fbc6232. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/US83Z2124103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd51db55fa32a9a9a2878827c87957fe8fb44c771a822a8cc9941fd2bb63521. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/DEH742048368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc090defbbe8b8d225d3db1263da4ad1221a88793b221070e12ab686323af9bb. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEH742048369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250b4dc77861c0dc04620050010b7493d4a55abb32c4791185d22641ce08932d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US83Z2231581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371c23be9832296ea8519dc7bdfb4dad32c9ef527043d59e760833a6f2d9ee6c. 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/US83Z2231582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a010e64de65f24be2662d0317e3b29061a8b20f1548ba8429e5373682384c5. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/US83Z2231587.
35th Cebu Popular Music Festival (A Tribute to Señor Sto. Niño)