Michael Joseph Porcaro (May 29, 1955 – March 15, 2015) was an American bass player known for his work with the rock band Toto. He retired from touring in 2007 as a result of being diagnosed with amyot
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 0x8ffc825226823243c279c698e9d76242279fb5e4d37a868c466b7ffeec1dd75f. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef72a807-7bec-421c-a031-63a98921cfcd.json and https://artists.proofprofile.net/proofs/artist/ef72a807-7bec-421c-a031-63a98921cfcd.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 0x08520548f90a789f35086d1f5958519279e57250ec4faa6b78cf51536fc480c2. 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/US4R31111131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98edb43aeda8616ab6f554b970f13f4c7d6e7c79faf613ae4d805b774267872d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/US4R31111132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a27b8d3a835f0877016146e1ffe2da63c1a03b4ba8dd15eab3318eb61d57e91. 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/US4R31111133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221efe09fd54e08e98e739a1acdd0637ee48ca475ccbcdbfc1428bc4223293ca. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/US4R31111134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1702e39d1d0fbec2c3a95388504a0e3546104e70b00351f6526b4fdbc935832d. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/US4R31111135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18adb267ac106618e057ca086e8f5422300b51582e45d5f6ed25f3536360aca1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US4R31111136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094088f08ba1eb483a444abad3d4e1ba8d5b1e82f5de4bcfc04c863b721a35b1. 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/US4R31111137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32391fe001b0076eebcfc45d9f11cd5847abe49a936620d211f1b6a102f773e. 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/US4R31111138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bc8013ce0c1e54f2e370a15ad5ba198b036fd5f477f82c10618a30f4d923d5. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/US4R31111139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519ee6d9f5baf28062515293aa5360a99c14b159e0fa8b5c33535723e2e9e26a. 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/US4R31111140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa376a2da30742086dcc549828eb06ad906178cfa3d9cb200a1a80b2d2a334b41. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/US4R31111141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ae87a34f2fd8cc991183ab02dfcd0826c3f916ab70b36ceb57c968a7aec5a8. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/US4R31111142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cba165402ba6732f7283f2b85f87ce90a1247a413884b134cc6a81c19ed5f23. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/US4R31111143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3aa0bc98491b31316f0ced4792fb7251a4107f46d69bcaa923474b108b3560. 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/US4R31111144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a5b8d808c4a7d1ff25d262da19871e04595d01a5f890bde9c86974b9b1ca8a. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/US4R31111145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01301bdb03f4becc837e31b7d567df104e3a963316e97e9fb33acb100475d2bc. 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/USA370505398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c343e9aec63cf07afede1d767c235c04033111acfe109dde67cb27219f41b6. 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/QM6XS1807538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e064b5149653fb14280214ed0937cb0703487697cc8086ecbb0a7d07d6b1b45. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/USV291497616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af7bf1bbc1d6ad2f4cfb6651cbc2664607e9b1455ab860842ef8ccb6bf35c14. 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/USRY20601030.
Back Against the Wall - a Tribute to Pink Floyd (Bonus Track Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5366ee6a300e76857c01473acf2af427e66c0fc30a27a8faecc80ee27d130f. 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/QM6MZ1451606.
The City of Prague Philharmonic Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8500d02841bcfbdccb517eb0f64964cf5b9b4600e48460800ddc2d2ac5a75b09. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBAJC9700732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf400e4d27b4e1ae32f23cd5d16d0e61bafbd74d9684148197dc42c3148d56c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/US4R30602426.