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 0x33dfc3147d685914356efe759611f916f5f230a365457e3ed8effd9f31fd64fd. 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/a4e1c392-1169-4a92-8800-104b3f465d5c.json and https://artists.proofprofile.net/proofs/artist/a4e1c392-1169-4a92-8800-104b3f465d5c.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 0xb9e580fdec9578ad19af432a8ba6a0187efe0f87961639df9087935ec0890fc0. 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/TCADR1819081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225094385debff988e41c1a329a18148dd3d704583b726de3946c9debfa27519. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCADR1819086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4adf1b5a6c271f12d6f3b45bf8aa8a2de42539a1dbe9cea5591918288b7331b. 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/TCADN1861823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe976a7de0dca31af4bc35929a91e953f110523fcf64d0f19a0767c7ea0b454c1. 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/TCADN1861829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30239acf7cf63ad1d852bab141f8a58211d866ca893597a899ff2a10e79e0c75. 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/TCADN1861833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732b3b83e15ad2d0ae4cbd7cfdb798343be9bde6ecfa0cb5832338dfcb780adc. 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/QZGLS1932448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda19ba646da2b64946d8f728eb56cac4c93ff359482a9cdbc215c1bb05ca4ecf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHZ51934068.
Rapping Mode Gavo "La Cumparsita", Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dab20e08705f0f8952804343dac499bfc6a8581c1f838a1b40a3ca86efd47bc. 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/QZGLM2045434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5e700ef21afe4f0bff1c17da3db49cd69dc5c90469c78162100724c1bbe7ba. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UYM122002261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de75a11cd6dd0011dbed6c90abc00481871bb43fff7595171f08b81fc42445c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UYM122002262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbdebb67307f69fae0585cc5769cce0e318b574c455848ecc5178f68100e075. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UYM122002263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85902ca08c017b242dfdef58dd2dce3677162e4496861b528e954e8e68de150a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UYM122002264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b10b1945b367ea0cb0ebcad0f892023d84dd43401541660516b36236bfca28. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UYM122002265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f53a1f348c91c4cec5d676fe7e66d1dbf6ef8117ec0bc2bd01b2e467fe4b51b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UYM122002266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13207cd81b6cd689e939f8438ee32105b3ef3f19599a683cccf1df7da5b66f50. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYM122002267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4875c1d594bea28e73bdc94f0150a4cfd46da23ec5ab059d8437b784792a9f8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UYM122002268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf569f04644e16cfb080e778331a20e88a875a7e62d7e9056e9a1cda365bf3fd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYM122002269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05f1ae9d9f6f306a8bc203de24c184e780708a5d0728eaf7c2dd5d3ec18e7ee. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UYM122002226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca060df453b8b20f5cdf5ecaa64ee687cbf9ce4223c8314ec9a04aed8c556a0d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UYM121903945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59961e1ec1fb2549a15878e1687d7bb28bf16ba5064e6a6fd0f01ba339730a44. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UYM122002270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699d92afc0c4bd9cb96fe795c95a2d8c037f13f0f9d5af0bd4f01759039ea7b1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UYM122002271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1edbafcdd64ecc3bf26242356928e7c4b98ffe362f2249cb88fb82192fc2e7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYM122002396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfcc5497de7e68c8f828e96356a6c99be67aa16827d49be2cde5e2a3c9c3d08. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UYM122003624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06da9a2d9d84bf5c73ce1f2073230ea4c7b7b9ca44f8d408e7cd890987249a8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYM122003625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15235479e590bfd47280ad26013ed6509c720187c13354fb58ed6ca846b013f3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYM122003626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6591e6bc59f9252f2df5582656292d352201d6308e56d72df658e9588a896d99. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYM122003627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c68c6dad1c692bfeb20dc12c34ae0a0c0af0bdab151dea594c7063c06c3a0b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYM122003628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9b5674ba11f3145c0a83a044f026f67a04c41b23a4696682e7eb75759139d8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UYM122003629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cfc27aec63b33d816cda09fd64ba30f3ec60058339ba0f01c5a659cf74ddeb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYM122002400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2867652df4340d95909ff3c8cbe4e709e5a4a68bbe10353b72ad34e22103b6. 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/QZES72079289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d3e0dc10a06c1f5c7e6f8bbaa2f3d377ad71391934b8cf028798b39b66ae0f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES72080343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e40c8cda5fb948ed137be051bdb21497ca413d0193a7977dfffa18e55e5c40a. 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/UYT142200043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd6254e833985c0fe958e6aea8e0af2e003b01250f5044d2069c1ccb1531d99. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYT142200044.