thumb|Monroe recorded the first version of the song with his orchestra in May 1954. "Mr. Sandman" (or "Mister Sandman") is a popular song written by Pat Ballard and published in 1954. It was first rec
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 0x8f9b5a25d4df2d79c5ba8363fb3cf67429c475b7f0da2f287a01951d4f73ed3c. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed8fdccf-e7ed-455b-869f-285b26d4b186.json and https://artists.proofprofile.net/proofs/artist/ed8fdccf-e7ed-455b-869f-285b26d4b186.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 0x904df644802cf0a67a09cf6df8c86a4d93405792a66a68ef101f5174d44b0de5. 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/QZHNA2223849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfd95ae71c9b3c9b374bb71f05f90a3904d75cdbce1e37999ca71808dcb8567. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZHNA2223850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214617efbb4a1f87d68a650eb1d96a5d3033e976db7493a00e6a8bdc3c1044f2. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZHNA2223851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7412301c8ffbf9a113c7fa77a9a81ce364f467d1ed251dc69fdf45c321e2df54. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZHNA2223852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d127a0ef6d70bf5156c6fdf859ca35707ab4e8cdcc36cf5e0a17c2090a6cb1. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZHNA2223853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9203bf39d409745d5d0b309bf57baabf8e2213d471ac14d4f13ce13ac4c80646. 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/QZHNA2223854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24bec42d3f0ccd5f8c7c24dafb90a1f9f03f98dcbfa805aeda4712d80b7718c. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZHNA2223855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41c05ad6243fea17e040e1461b845a56be56b7c2c7de32e3e1ca415c3843fc9. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZHNA2223856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f749fdf78034a252eb51f36aaa514131d5c56318598a9e8be4ca2b50e06a9b. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZHNA2223857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4c1a5e48f4c01b7e78e6c9648e5d0da326f7685e147d580afe8bf2d7064908. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHNA2223858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c659f8df83472eac88fdd485f1a3d142464d911f23f4d784fed35ad32fa574c. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZHNA2223859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f291b5130e504c126ab6e024141191174a9da391b524cefdbec6045d861984. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZHNA2223860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf929e782623ad4c4378815a858fbad6b29a582f0951e10a1bbff19d0579164ac. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZHNA2223861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3e8ae337df17381524e5cb4743e69cc8526630476fb4d1bee4bd2bdadfc7cf. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZHNA2223862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b52e61a643a0300f2375dc01f217729e00053b114f3348f06c159796ffb256. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZHNA2223863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c1424be0abd5e56c29765ccc5ecb1c06be7a5d2ec4a8e36810c4efe981b2d5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHNA2223864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fdddbdf987188b21bcedeea107e017a0348bbc0179f781415f0f0bc116deee7. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZHNA2223865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe538bd0fb0c1fb8736138e464d9aeebcbac3875d38d80d4900845cd6ba67831. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZHNA2223866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4feca9e9ac1bdd5d463472b6773d035e6db8bee142fa340c5701806e339cd7cc. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZHNA2223867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935e7ed64f60206c0ce6f30962de5045fcabe13495d282ac4c6c30a8aef3ce0a. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZHNA2223868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6eb69499798468d43acf7410bf18989ea84fcfd40c5d9948a3f02c61818a832. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZHNA2223869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07715e29f3774f426584d893564f8f109b8d11864d6794d722966cec66e2307. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZHNA2223870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f13d0dbb794a75b46ecc51102964e58f64f1ad88db2a430613d5e5fc7b08b6f. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZHNA2223871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09bfe4115c82c3db82287b1ad920c7d9498ec132057e6510b402bcc9c2c26b7. 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/QZHNA2223872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a86fc82640db6de49a4e209b89b266023ab27abd00d29627e86313a2ae57488. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZHNA2223873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b20005b44a9ba7666f45711e137329fa5a6609209ca270b490401244c6295e. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZHNA2223874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f10c86879f997be9d7b637e1d32769b12d8e8d9de05c83a7d97722960778cc. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHNA2223875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5d6adb0417d25a92afd71054b66da6acb25ec4cb915d79c40c88e8d9d0612a. 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/QZHNA2223876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eae728ae3ec42cdefa595ff3f4b42df0e44558c3468e05a2e467f7da715a5ec. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHNA2223877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9964b2b75b4e110f8253951f53d159fcf8d18523565fd727b7d82192c49a223b. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZHNA2223878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472cbe0c6f7d372bd7ac82650e3fdd9b839d8dfc42d47fed1b11f843d836a9c1. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZHNA2223879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f96bbe644e5f9691f9f264da8f4457a36df54d03c2d5c8b835b98d5a7e142f4. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHNA2223880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91eade743ac168054da4d4c3cc34fc0b0ffa40722afd3e96a707c7f68e4b7ad1. 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/QZHNA2223881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff70f673fad9c4df1cee5ab2a615f82ea3265e9ff2b32b38bbce126097b69d2e. 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/QZHNA2223882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bc6d56332925235708cc74a0bc5e8a68d0f12edca7df686af6d841083df171. 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/QZHNA2223883.