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 0xe13918f3e2b286e1e2597c44ea6b42ec5742888f91a8af014bfadd8f564af905. 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/87347573-82ac-4c55-8867-f8bd9ed863e0.json and https://artists.proofprofile.net/proofs/artist/87347573-82ac-4c55-8867-f8bd9ed863e0.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 0x527bea25b15d3fba0b62f47fde6bcf0f96971e131cfcc2589012aa65828ba027. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/ESAAI0260063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88ee453165828181738e7fcf7cce085362aac8545904423017c818dd63e4065. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ES5531102336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1505fa54e191472263e2c3ec07d888bc3c9e9913329e3f4d08319e67cdb1aa30. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/ES5531102337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e906e0f5c6a9b0ca9974179055f49a6be3396b5c363ad4d2d5120d25f3fdd4b. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/ES5531102341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f0695294581d2bbeec8ff73f1176ea198b13e6a8bf3b393e36e4445470d764. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ES5531102344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4866d011d9a8d94e6e0e3a01e103163167b9081ee7e09f4a7e2eecab7ab4b35. 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/ES5531102346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868ad3f2365a4ac06ac7672f03bdcffeeedc866366067364d68b02e1d463295a. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/ES5531102347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ee8c73f02ba2408d4b8de5cceaa59241297bbdaddb575cfbb7a7966787db7e. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ES5531102348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999b12b1736482a5e1033392e669a1f2603a59e5b5e2fea9e5de4e890808d3c8. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/ES5531102353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8308ed9aec54f6567c2007e3fb8f43c851a04625e03a09c09a6faddaaeaa49b8. 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/ES5531102357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698b738a79616efe909de0ec7e09595b7d883470536e54b207e7d1ac05aea506. 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/ES5531102360.
Ronda de la Tuna Universitaria. 25 Canciones y Pasodobles Estudiantiles
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3395565617f163480106cbb962696ef18fc2bcecd606c36586770d3bb41b9c5b. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/USV351331565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a0c2dd3d5c1adc8ea4bf5dc09d40dabbaf1464d5de727a1ddf4f8fad8b9946. 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/USV351331567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd63287c2aea7d9e8aeb3c1c4def26d31c715f3d5b466b2a07c20daebf6b77ec. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USV351331570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fe91715b5a32707c4b63b43eb598b305e2eaa14c53b9d59a15320b287e6b3f. 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/USV351331573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f94dfcb6dee039c4ecc2d77cbccd71d26f4fac99b9deac97251d927c867d5fe. 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/USV351331576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044d814f09e7e6475b1c612c8c9df66b3b6d433fb26537d8694438f7d6130d1b. 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/QM6MZ1456276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989f47672353b6767b02abcac2a606ce034c76dcc1677c6c8a9f26798c28091a. 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/QM6MZ1456277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7677085659b0f2405ea74a236fdc696bea43adf03fd873dd8ca17f3f81d2a2. 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/QM6MZ1456288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ebe86a231127b5922d089c6f85f4d8b2649be5999a5e71fdbc7c21f92b4ede. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QMBZ91522197.